Problem: Given a total price and a tax rate, calculate the original sale price.
Example: Total Price = 27.03 and Tax Rate = 0.08125, or 8.125%
Sale price = Total Price / (1 + Tax Rate)
= 27.03 / 1.08125
= 25.00
Tax Amount = Total Price - Sale Price
= 27.03 - 25.00
= 2.03
