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Question

A square land has length 210 ft. The cost of fencing the land is $ 8/ft. The final cost of fencing the land is .

A
$64
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B
$6410
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C
$1610
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D
$810
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Solution

The correct option is B $6410
Length of one side of the square land = 210 ft.

You know, perimeter of a square = 4 x length of one side.

∴ Perimeter of the square land = 4×210=4×2×10 =810 ft.

A rational number x An irrational number = Irrational number.

The cost of painting is $ 8/ft.

So, the total cost of painting will be =
$8×810=$8×8×10=$6410

∴ Total cost of painting = $6410
and $6410 becomes an irrational number.

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