I think it should be 51 ft^2 as we know that p*h is 3 and p is 24 so h is 1/8 this giving us 3.SA = 2(24)+3SA = 48+3SA = 51
with your formula, multiply the B by 2 and and it to the P multiplied by the height. Since they are all in feet, you do not have to convert.
24X2= 48+24X3 or 72 SA=120
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