Question

A book was sold for Rs.660 with a profit of 10%. What was its cost price?​

Answer 1

Answer:

600 rs

.................

Answer 2

let cp be x

profit = sp-cp

profit = 660-x

$profit percent =\frac{profit*100}{cp}$

$10=\frac{660-x*100}{x}$

$\frac{10x}{100}=660-x$

$\frac{x}{10}=660-x$

$x=10(660-x)$

$x=6600-10x$

$11x=6600$

$x=\div{6600}{11}$

x=600

therefore x= cp = Rs.600

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