Miriam bought five cases of motor oil on sale. A case of motor oil normally costs $24.00, but she was able to purchase the oil for $22.50 a case. How much money did Miriam save on her entire purchase?
Subtract the sale price from the regular price: $24.00 – $22.50 = $1.50. Multiply the remainder by the number of cases to get your answer: $1.50 × 5 = $7.50.