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?

• A. $7.50
• B. $1.50
• C. $8.00
• D. $22.50

Answer: (A)

To determine how much money Miriam saved on her entire purchase of motor oil, we first need to calculate the total cost both at the regular price and at the sale price.

1. Calculate the normal cost for five cases:

The normal price per case is $24.00. Therefore, for five cases, the total cost would be:

[

5 \text{ cases} \times $24.00/\text{case} = $120.00

]

2. Calculate the sale price for five cases:

The sale price per case is $22.50. Thus, for five cases, the total sale cost would be:

[

5 \text{ cases} \times $22.50/\text{case} = $112.50

]

3. Calculate the savings:

The savings can be found by subtracting the total sale price from the total normal price:

[

$120.00 - $112.50 = $7.50

]

This calculation shows that Miriam saved $7.50 on her entire purchase, which aligns with the correct answer choice. This methodical approach illustrates how