5 percent of 300 is 15 so it is 15 sq ft.
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If you mean "how many 3x5-inch cards cover 300 sq. ft": 1 card = 3*5 =15 sq. in. = 15/144 sq. ft. (12x12 = 144 in^2 = 1 ft^2) N cards *15/144 = 300 N = (300*144)/15 = 2880
8 ft * 5 ft = 8*5 sq ft = 40 sq ft
13 ft * 5 ft = 65 sq ft = 6.039 sq metres.
About 1500 sq ft
5 sq ft = 0.465 sq metres.