since stacy is bringing $200, and the initial cost is $87.96 you would have to subtract $200-87.96 which equals $112.04 this is the money left that stacy could buy shirts with, to figure out how many she needs you would have to do $112.04÷$30.00 this equals a decimal of 3.734666666666667 which would have to round down to 3 because stacy cant make it 4 shirts because she doesn't have enough money. So stacy can purchase a maximum of 3 shirts.
hope this helped:))
