The answer depends on the measurement units used for "100 x 100". It should be clear, even to you, that the square footage of 100 inches x 100 inches will be different from 100 yards x 100 yards or 100 metres x 100 metres, etc.
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It is not entirely clear what the question is asking but the areas can be configured as80000 sq ft = 400 * 200 sq ft leaving an area of 400 * 200 sq ft, then 40000 sq ft = 400 * 100 sq ft leaving an area of 400 * 100 sq ft, then 10000 sq ft = 100 * 100 sq ft leaving an area of 300 * 100 sq ft, then 5000 sq ft = 100 * 50 sq ft leaving an area of 250 * 100 sq ft.
100' x 1"= 100 sq ft. x 4" deep= 33.3 CUBIC feet. That is about 1.24 cubic yards.
four ft. x four ft. = sixteen sq. ft. example: 4ft. x 4 ft. = 16 sq. ft.
10 x 10 = 100 (sq ft).
That would be 68.87 acres.