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The yellow surface area is:
yellow = 14 * 8 = 112
The red surface area is:
red = 14 * 6 = 84
The pink surface area is:
pink = 8 * 6 = 48
The blue surface area is:
blue = 5 * (10.5 - 6) = 22.5
The green surface area is:
green = (14 - 8) * (10.5 - 6) = 27
The total surface area is:
= yellow + 2.red + 2.pink + 2.blue + 2.green
= yellow + 2.(red + pink + blue + green)
= 112 + 2.(84 + 48 + 22.5 + 27)
= 475