ANSWER and EXPLANATION
To find the surface area of a rectangular prism, we find the area of the top, front and left sides of the prism and add them by using the formula:
SA = 2{(l * h) + (l * w) + {w * h)}
where l = length
w = width
h = height
From the figure:
l = 5 in
w = 4 in
h = 3 in
Therefore, the surface area:
SA = 2{(5 * 3) + (5 * 4) + (4 * 3)}
SA = 2{15 + 20 + 12}
SA = 2(47)
SA = 94 square inches
Therefore:
Neither of them is correct. The surface area is twice the sum of the areas of the top, front and left side of the of the prism or 2(5 * 3 + 5 * 4 + 3 * 4) which is 94 square inches.