Discussion

What will be the cost of building a fence around a square plot with area equal to 289 sq ft, if the price per foot of building the fence is Rs. 58?

Answer: A

Find the side, then the perimeter, then price it.

\[ \text{side} = \sqrt{289} = 17 \text{ ft} \]

\[ \text{perimeter} = 4 \times 17 = 68 \text{ ft} \]

\[ \text{cost} = 68 \times 58 = \text{Rs. } 3944 \]

The fence follows the boundary, so it is priced by perimeter, not area - the data are complete, so "cannot be determined" is a trap.

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