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We are using Opencart for E-commerce. Currently We are facing Calculations issues into the Invoices. Below are the Examples.
For Example - One Product A is Costing Rs. 500 Inclusive of Taxes (5%) shown in open Cart Front End. Suppose The Customer Used a Coupon Code of 18% Discount on it. So The Price Comes Rs.410 Inclusive of Taxes (5%).
Now What i need is Invoice Should Show The Gross Price (Rs.390) + Tax (Rs.19.5 Rounded off to Rs.20) = Total (Rs.410)
The Above Calculation Should also work when more than Two items are purchased and Coupon is Applied only on One Product. Example is given Below
For Example - Another Product B Cost is Rs. 610 inclusive of Tax (5%) and Customer has added along with Product A (See above example)
So The Final Invoice Should Show the Calculations Perfectly Like This
The Gross Price (Rs.390) + Tax (Rs.19.5 Rounded off to Rs.20) = Total (Rs.410)
The Gross Price (Rs.581) + Tax (Rs.29.05 Rounded off to Rs.29) = Total (Rs.610)
Grand Total - Rs.1020=00