To get your answer first you multiply $84.50 times 20 months which is $1,690, then you multiply $50.50 times 20 months to get 1,010. Then you subtract 1,690, and 1,010, to get 680. Now you divide 680 by 4 to get 170 which is 1/4 of what is left in her account. So Jasmine spent a total of $170 to go to music camp.