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If the cost of x metres of wire is d rupees, then what is the cost of y metres of wire at the same rate?

Rs. (xy/d)
Rs. (xd)
Rs. (yd)
Rs. (yd/x)

Correct Answer: Rs. (yd/x)

Explanation:

Cost of x metres = Rs. d.

Cost of 1 metre = Rs.(d/x)

Cost of y metres = Rs.[(d/x).y] = Rs.(yd/x)

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