Answer:
270 7/16 in^2.
Step-by-step explanation:
The surface area equals the sum of the areas of 3 pairs of congruent rectangles.
These are 2 * 8 * 1 3/4 + 2 * 8 * 12 1/2 + 2 * 1 3/4 * 12 / 1/8
= 16 * 7/4 + 16 * 25/2 + 2 * 7/4 * 97/8
= 28 + 200 + 42 7/16
= 270 7/16 in^2.
