30 - (30 / 100 * 15) =
30 - 4.5 = 25.50
Question: What is 15% off 30?
Step 1: Get the result of Number (30) / 100 * Percent (15).
30 / 100 * 15 = 4.5
Step 2: Subtract step one's result (4.5) from the number (30).
30 - 4.5 = 25.50
Result: 15% off 30 = 25.50.