Multiply this 1 by 100 to find the original price 100 previous 1 2. Solving for x we get the above formula. All you have to input is the amount of sales tax you paid and the final price on your receipt.
Divide the percentage added to the original by 100.
Current price is 100 - 25. Opposite of the discount percent. Divide Final Amount by Decimal. Step 2 Divide the percentage by 100 to convert it to a decimal.