It is very easy to calculate the GST, VAT, TAX on original price, in order to do that we need to multiple the original price by the TAX percentage, like bellow:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | Original price is:100 GST is: 10% Final price is: original price + original price * Tax 110 = 100 + 100 * 10% Or simpler: 110 = 100 * 1.1 1.1 is calculated by 100% + 10% |
To calculate the original price from final price, we need to do the reverse calculation.
Easiest way is to divide the final price by the tax price like below:
1 2 3 4 5 6 7 8 9 | Original price = final price / tax percentage 100 = 110 / 1.1 1.1 is calculated by 100% + 10% |
For reverse calculating 25%, we only need to change 1.1 with 1.25
