Surface area is given by;
S.A = 2(wl + hl + hw)
From the question;
l =24 w = 20 h = 15
substitute into the formula;
S.A =2 ( 20*24 + 15*24 + 15*20)
= 2( 480 +360 + 300)
= 2(1140)
= 2280 ft²
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