30 - (30 / 100 * 40) =
30 - 12 = 18
Question: What is 40% off 30?
Step 1: Get the result of Number (30) / 100 * Percent (40).
30 / 100 * 40 = 12
Step 2: Subtract step one's result (12) from the number (30).
30 - 12 = 18
Result: 40% off 30 = 18.