14a) This question asks for the discount to be added after everything else. S= 12 J=19 3S + 2J -3 = Cost with discount applied to total ^ This expression adds to costs, then takes away the $3 discount as the end. 14b) This questions says the discount is added on every shirt, we get a similar expression: 3(S-3) + 2(J-3) = Cost with discount applied on every shirt and jeans
14c) The difference between a) and b) is that: > the discount in a) is applied on the total, meaning a lower discount > the discount for b) is applied on each shirt and jeans, meaning a greater discount
14d) If I were the shop owner I would be more specific of what the discount included, for example we don't know whether to discount each product (shirts and jeans) or only discount the total.