Chain Rule Practice Test 1 with solutions

Cost of 15 note books consisting of 125 pages = Rs 690
Cost of 1 note book consisting of 125 pages = Rs $\frac{690}{15}$
Cost of 1 note book consisting of 1 page = $\frac{690}{15\times 126}$
Cost of 250 note books consisting of 84 pages = $\frac{690\times 250\times 84}{15\times 125}$
= Rs 7,728