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Grand Total not updated when discount code is applied

Please follow the below steps might be useful.
Path:- app/code/core/Mage/Sales/Model/Config/Ordered.php

Comment this code:::

 /**
     * Aggregate before/after information from all items and sort totals based on this data
     *
     * @return array
     */
    protected function _getSortedCollectorCodes() {
        if (Mage::app()->useCache('config')) {
            $cachedData = Mage::app()->loadCache($this->_collectorsCacheKey);
            if ($cachedData) {
                return unserialize($cachedData);
            }
        }
        $configArray = $this->_modelsConfig;
        // invoke simple sorting if the first element contains the "sort_order" key
        reset($configArray);
        $element = current($configArray);
        if (isset($element['sort_order'])) {
            uasort($configArray, array($this, '_compareSortOrder'));
        } else {
            foreach ($configArray as $code => $data) {
                foreach ($data['before'] as $beforeCode) {
                    if (!isset($configArray[$beforeCode])) {
                        continue;
                    }
                    $configArray[$code]['before'] = array_unique(array_merge(
                                    $configArray[$code]['before'], $configArray[$beforeCode]['before']
                    ));
                    $configArray[$beforeCode]['after'] = array_merge(
                            $configArray[$beforeCode]['after'], array($code), $data['after']
                    );
                    $configArray[$beforeCode]['after'] = array_unique($configArray[$beforeCode]['after']);
                }
                foreach ($data['after'] as $afterCode) {
                    if (!isset($configArray[$afterCode])) {
                        continue;
                    }
                    $configArray[$code]['after'] = array_unique(array_merge(
                                    $configArray[$code]['after'], $configArray[$afterCode]['after']
                    ));
                    $configArray[$afterCode]['before'] = array_merge(
                            $configArray[$afterCode]['before'], array($code), $data['before']
                    );
                    $configArray[$afterCode]['before'] = array_unique($configArray[$afterCode]['before']);
                }
            }
            uasort($configArray, array($this, '_compareTotals'));
        }
        $sortedCollectors = array_keys($configArray);
        if (Mage::app()->useCache('config')) {
            Mage::app()->saveCache(serialize($sortedCollectors), $this->_collectorsCacheKey, array(
                Mage_Core_Model_Config::CACHE_TAG
                    )
            );
        }
        return $sortedCollectors;
    }

 Replace the above code with:::

/**
     * Note: While applying coupon code, Totals are not updating due to uasort not working in php7 then
     *
     * modified the _getSortedCollectorCodes() function as shown below.
     */
    protected function _getSortedCollectorCodes() {
        if (Mage::app()->useCache('config')) {
            $cachedData = Mage::app()->loadCache($this->_collectorsCacheKey);
            if ($cachedData) {
                return unserialize($cachedData);
            }
        }
        $configArray = $this->_modelsConfig;
        // invoke simple sorting if the first element contains the "sort_order" key
        reset($configArray);
        $element = current($configArray);
        Mage::log(var_export($element, true));
        if (isset($element['sort_order'])) {
            uasort($configArray, array($this, '_compareSortOrder'));
        } else {
            foreach ($configArray as $code => $data) {
                foreach ($data['before'] as $beforeCode) {
                    if (!isset($configArray[$beforeCode])) {
                        continue;
                    }
                    $configArray[$code]['before'] = array_unique(array_merge(
                                    $configArray[$code]['before'], $configArray[$beforeCode]['before']
                    ));
                    $configArray[$beforeCode]['after'] = array_merge(
                            $configArray[$beforeCode]['after'], array($code), $data['after']
                    );
                    $configArray[$beforeCode]['after'] = array_unique($configArray[$beforeCode]['after']);
                }
                foreach ($data['after'] as $afterCode) {
                    if (!isset($configArray[$afterCode])) {
                        continue;
                    }
                    $configArray[$code]['after'] = array_unique(array_merge(
                                    $configArray[$code]['after'], $configArray[$afterCode]['after']
                    ));
                    $configArray[$afterCode]['before'] = array_merge(
                            $configArray[$afterCode]['before'], array($code), $data['before']
                    );
                    $configArray[$afterCode]['before'] = array_unique($configArray[$afterCode]['before']);
                }
            }
            foreach ($configArray as $code => $data) {
                $largest_small = $smallest_large = 0;
                foreach ($data['after'] as $afterCode) {
                    if (isset($configArray[$afterCode]['sort_order']) && $largest_small < $configArray[$afterCode]['sort_order'])
                        $largest_small = $configArray[$afterCode]['sort_order'];
                }
                foreach ($data['before'] as $beforeCode) {
                    if (isset($configArray[$beforeCode]['sort_order']) && ($smallest_large == 0 || $configArray[$beforeCode]['sort_order'] < $smallest_large))
                        $smallest_large = $configArray[$beforeCode]['sort_order'];
                }
                if ($smallest_large <= $largest_small + 1) {
                    $add = $largest_small + 1 - $largest_small;
                    if ($smallest_large == 0)
                        $smallest_large = $largest_small + 1;
                    foreach ($configArray as $code1 => $data1) {
                        if (!isset($data1['sort_order']))
                            break;
                        if ($smallest_large <= $data1['sort_order'])
                            $configArray[$code1]['sort_order'] += $add;
                    }
                }
                $configArray[$code]['sort_order'] = $largest_small + 1;
            }
            uasort($configArray, array($this, '_compareSortOrder'));
        }
        $sortedCollectors = array_keys($configArray);
        if (Mage::app()->useCache('config')) {
            Mage::app()->saveCache(serialize($sortedCollectors), $this->_collectorsCacheKey, array(
                Mage_Core_Model_Config::CACHE_TAG
                    )
            );
        }
        return $sortedCollectors;
    }

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