Joe is in charge of purchasing office supplies and his budget is $175.00. Paper is $21.99 a box, toner cartridges are $52.90 each, and folders are $0.99 each. All office supplies are 20% off. If Joe needs to buy 3 boxes of paper and 2 toner cartridges, how many folders can he buy?

3 boxes of paper cost 3*21.99=65.97, 2 toner cartridges cost 2*52.90=105.8. Given that there's 20% off for all office supplies, then 3 boxes of paper cost 3*$21.99*0.8=$52.78, 2 toner cartridges cost 2*$52.90*0.8=$84.64, the price of folder is $0.99*0.8=$0.792. So, after buying these things given that there's 20% off for all office supplies, he will have only $175-$52.78-$84.64 = $37.58. As 37.58/0.792=47.45, hence he can buy only 47 folders

Answer is 47

21.99 * 3 = 65.97 * 0.80 = 52.78 for paper

52.90 * 2 = 105.80 * 0.80 = 84.64 for toner

52.78 + 84.64 = 137.42 total

175-137.42 = 37.58 he can spend on folders

0.99*0.80 = 0.79 each folder

37.58/0.79 = 47.57

he can by 47 folders