Question
Find $\frac{d y}{d x}$ if $y =\frac{a x+b}{b x+a}$ (a and $b$ are constants).
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| Item | Year $- 2010$ | Year $- 2014$ | |
| Quantity | Price (₹) | Price (₹) | |
| Wheat | $60$ | $15$ | $18$ |
| Rice | $40$ | $32$ | $40$ |
| Bajra | $15$ | $12$ | $14$ |
| Tuvar Dal | $25$ | $50$ | $70$ |
| Year | $2010-11$ | $2011-12$ | $2012-13$ | $2013-14$ | $2014-15$ | $2015-16$ |
| Index number of food items | $134.8$ | $115.28$ | $115.57$ | $107.29$ | $109.91$ | $112.80$ |