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Exposed surface area of joined cuboids

Question 1 of 8

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A solid is made by attaching a smaller cuboid on top of a larger cuboid. There is no overlap of volume

The lower cuboid has length L = 9 cm, depth W = 8 cm and height H = 4 cm

The upper cuboid has length l = 4 cm, depth w = 2 cm and height h = 3 cm

The whole l by w base of the upper cuboid touches the lower top. These two touching surfaces are internal

Coat every exposed face, including the underside of the lower cuboid

Not to scale. The upper base is entirely in contact with the lower top