to make the math easier to do in your head, think of this problem as
(40 x 100) - (40 x 4) as 100-4 = 96
so 4000 - 160 = 3840
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40' x 40' (1,600 square feet) = 177.77 square yards.
12 inches = 1 foot 60 inches = (60 / 12) = 5 ft 96 inches = (96 / 12) = 8 ft (5 ft x 8 ft) = 40 square feet
60 * 40 = 2400 ft²
If that's 40 x 60 feet, it's 2400 square feet. If that's 40 x 60 inches, it's 16 and 2/3 square feet.
13.8 square feet