If 39.99 is 100%, and you are trying to find 20%... 1. you need to set it up as a ratio (of course, you do not need to do this, but it is easier for me to do it this way) 2. the ratio will look like this : 39.99/100% x/20% 3. all we need to do from here is to cross multiply! 4 39.99 x ---------- = ---------- 100 20
-price is on the top and percent on the bottom -you would now do 39.99 times 20 -then divide by 100 5. once you have 20% of 39.99, you need to subtract that answer from the total 6. 39.99 - 7.998 = 31.992 (you need to round to the nearest hundredth)
