Final answer:
The surface area to be painted is 2160 in.² To find the surface area to be painted, calculate the perimeter of the trunk and multiply it by the width of the trim.
Step-by-step explanation:
To find the surface area to be painted, we need to calculate the perimeter of the trunk and multiply it by the width of the trim.
Perimeter of the trunk = 2(front + back) + 2(sides) = 2(36 in. + 318 in.) + 2(3 in. + 3 in.) = 2(354 in.) + 2(6 in.) = 708 in. + 12 in. = 720 in.
Surface area to be painted = Perimeter × Width = 720 in. × 3 in. = 2160 in.²