Question

The price of the book is marked 20% above the C.P. If the marked price of 1 point
the book is Rs. 180, then what is the cost of the paper used in a single copy
of the book?​

Answer 1

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Clearly, marked price of the book = 120% of C.P.

Also,

Cost of paper = 25% of C.P

Let the cost of paper for a single book be Rs. n

Then,

 

$120 :25 =180 : n⇒ \: = \: (\frac{25 × 180)}{120})$

$\huge\ \: = Rs \: 37.50$

Hope It'll Helps!

Answer 2

Explanation:

$clearly \: marked \: price \: of \: the \: book \: = 120 \: of \: c.p. \\ also \: cost \: of \: paper = 25 \: of \: c.p \\ let \: the \: cost \: of \: paper \: for \: a \: single \: book \: be \: rs.n \\ then \: 120: \: 25 = 180: \: n \\ n = rs \frac{(25 \times 180)}{120} = rs \: 37.50$