I need help with this math:
if I have Subtotal amount = 10Tax rate 8.5%then Grand Total = 10 + (10 * 8.5 / 100) = 10.85
Now what if I have Grand total =10.85 and tax rate 8.5% - how to calculate the Subtotal ???
Multiply your total by 1.0825.
are you sure this right? because 10.85 * 1.0825 = 11.745125 (not = 10) - how you got the number 1.0825 anyway?
Calculating the total including 8.5% tax can be done by multiplying the subtotal by 1.085:10.00 * 1.085 = 10.85
Calculating the subtotal from the total including the 8.5% tax is done by apply the mathematical opposite (division):10.85 / 1.085 = 10.00
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