A book seller sold 300 copies of a book at the profit of 15%. If cost price of a book is Rs48,find the selling price of the book.

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Solution

Dear Student,

$C o s t p r i c e o f 1 b o o k = R s . 48 C o s t p r i c e o f 300 b o o k s = 300 \times 48 = R s . 14400 P r o f i t % = 15 % W e k n o w, P r o f i t % = \frac{P r o f i t}{C P} \times 100 \Rightarrow 15 = \frac{P r o f i t}{14400} \times 100 \Rightarrow P r o f i t = \frac{15 \times 14400}{100} \Rightarrow P r o f i t = R s . 2160 S P = C P + P r o f i t S e l l i n g p r i c e o f 300 b o o k s = C P o f 300 b o o k s + P r o f i t e a r n e d S e l l i n g p r i c e o f 300 b o o k s = 14400 + 2160 = R s . 16560 S e l l i n g p r i c e p e r b o o k = \frac{S e l l i n g p r i c e o f 300 b o o k s}{N u m b e r o f b o o k s} = \frac{16560}{300} = R s . 55.2$

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