Grand total subtract 8% tax to get the subtotal. How do I do this in actual numbers?
n * 1.08= 100... that's how the tax was added to the subtotal (I made up the 100 as the grand total)n = 100/1.08.... this gives the subtotal...
Divide the grand total by 100, then times that number by 8. Subtract this new number from your original total.
subtotal = (100-8)% x grand total
multiply the price times .08 for the tax, or multiply the price times 1.08 for the total price and tax.