Answer: A tip on these problems is that if you're looking for 20% of a number like 50 then you can
2.0 * 5.0 = 10
So 20% of 50 is 10
IF WE ARE LOOKING FOR 20 PERCENT OF 19.99 THEN
2.0 * 1.999 = 3.99
So then 19.99 - 3.99 = 16
So for the first office supply the item is a the price of $16.
Try the rest! :D