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### Discussion :: Chain Rule

1.  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?
2.  A. Rs.$$[\frac { XY} { d}]$$ B. Rs. (xd) C. Rs. (yd) D. Rs.$$[\frac { Yd} { X}]$$

 Cost of 1 metre = Rs$$[ \frac { d } { X }]$$
Cost of y metres = Rs[$$[ \frac { d } { X }.Y]$$Rs$$[\frac { Yd} { X}]$$