30 - (30 / 100 * 20) =
30 - 6 = 24
Question: What is 20% off 30?
Step 1: Get the result of Number (30) / 100 * Percent (20).
30 / 100 * 20 = 6
Step 2: Subtract step one's result (6) from the number (30).
Result: 20% off 30 = 24.