You can't have cubic feet in an area. Area is for two dimentions and volume is for 3 dimentions.
20ft by 20ft is 400ft2
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20-ft x 11-ft x 2-ft = 440 cubic ft
100*20*2 = 4000 cubic feet
None, to work out cubic feet you need three dimensions, 3 feet x 20 feet is 60 square feet, to get to cubic feet you need another dimension.
32 cubic feet
624 cubic feet