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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?

/ Aptitude, Chain Rule / By
Question: 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?
[A].

Rs. xy
d

[B].

Rs. (xd)

[C].

Rs. (yd)

[D].

Rs. yd
x

Answer: Option D

Explanation:

Cost of x metres = Rs. d.

Cost of 1 metre = Rs. d
x
Cost of y metres = Rs. d . y = Rs. yd .
x x