Reviewed by Thomas J. Catalano Fact checked by Vikki Velasquez The discount rate refers to the interest rate used when calculating the net present value (NPV) of an investment. It represents the ...

Original Price * (1 – Percentage Decrease). If you need to reverse a discount or calculate the original price from a tax-inclusive amount, divide the adjusted price by: (1 – Percentage Decrease).

We explain how to fix the issue when Excel is not auto-calculating formulas. Excel is an advanced tool when calculating formulas for statistics.

How to Calculate Inflation-Adjusted Prices To find out how inflation has affected the value of money over time, calculations can be done by hand or using spreadsheets.