30 - (30 / 100 * 100) =
30 - 30 = 0
Question: What is 100% off 30?
Step 1: Get the result of Number (30) / 100 * Percent (100).
30 / 100 * 100 = 30
Step 2: Subtract step one's result (30) from the number (30).
30 - 30 = 0
Result: 100% off 30 = 0.