Answer:
The surface area is 286.5in.
Step-by-step explanation:
7.5 * 11.5 = 86.25 * 2 = 172.5in for two big rectangles
7.5 * 3 = 22.5 for little rectangle
11.5 * 3 = 34.5 * 2 = 69 for two medioum rectangles
7.5 * 3 = 22.5 for the smallest rectangle
22.5 + 69 + 22.5 + 172.5 = 286.5 in SA
