To find the total surface area of the rectangular prism, we need to calculate the surface area of each of the six faces and then add them together.
Surface Area = 2lw + 2lh + 2wh
Surface Area = 2(8)(9) + 2(8)(11) + 2(9)(11)
Surface Area = 144 + 176 + 198
Surface Area = 518 square inches
Now, we need to calculate the cost of the contact paper. Since it costs 8¢ per square inch, we can simply multiply the total surface area by 8¢:
Cost of contact paper = 518 * 8¢
Cost of contact paper = $41.44
Therefore, Erin spent $41.44 on the contact paper. The closest option is $41.44.
A rectangular prism is shown. The length of the rectangular prism is labeled as 11 inches, the height is labeled as 9 inches and the width is labeled as 8 inches.
The contact paper costs 8¢ per square inch. She will only pay for the contact paper used to cover the box, even if there is waste or extra. How much money did Erin spend on the contact paper? $20.72
$41.44
$48.12
$73.14
1 answer