Answer :
Let's convert everything to feet, first.
The foundation is 21x8x1/3.
Concrete is $32/cubic foot.
21x8x1/3=56 cubic feet of concrete. At $32 per cubic foot, 56x32=$1792.
The foundation is 21x8x1/3.
Concrete is $32/cubic foot.
21x8x1/3=56 cubic feet of concrete. At $32 per cubic foot, 56x32=$1792.