Percentages & Shopping Math How to Calculate a Raise Percentage Raise % = (new pay - old pay) / old pay x 100. Formulas, examples, per-paycheck impact, inflation and typical raises. October 2, 2026
Date & TIme What Percent of the Year Has Passed? Formula and Month-by-Month Table How much of the year has passed at the end of each month, the exact halfway point, and an Excel or Google… September 28, 2026
Percentages & Shopping Math Stacked Discounts Don’t Add Up: Why 20% + 10% Doesn’t Equal 30% Off A store advertises 20% off, you have a 10% coupon, and it’s easy to assume you’re getting 30% off the original price.… September 19, 2026
Percentages & Shopping Math Percentage of a Percentage: Why You Can’t Just Add Them Together 25% of 80% isn't 105%, and it isn't 20 percentage points either. Here's the actual math behind stacking two percentages. September 13, 2026
Percentages & Shopping Math Reverse Percentage Explained: Finding the Original Price After a Discount If you only know a discounted price, here's the formula to work backward to the original price, with a worked example and… September 11, 2026