It is: 30 times 3 = 90 square feet
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20 ft
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.
The area of the house is 1200 sq. ft
3000 sq-ft multiplied by $10=$30,000 (you would multiply your square-footage by your cost per sq-ft)
four ft. x four ft. = sixteen sq. ft. example: 4ft. x 4 ft. = 16 sq. ft.