Macy’s is having a sale in which all jeans at $30. The sales tax is 8%. If John buys n pairs of jeans during this sale, the total cost of his purchase will be 30n+0.08(30n)
This expression is correct. It shows the price John pays for the jeans on the left side of the + symbol (30n), and the amount of tax he has to pay on the right side of the symbol (0.08(30n)).
