Question

a man sold a book at a loss of 20% if he had sold the book for rupees 12 more he would have gained 10% find the cost price of the book​

Answer 1

at 20% loss =80%

5% more gain = 105

so excess gain =105–80= 25

if article sold more 25 than cost price 100

—————————50——————100*50/25= 200

so cost price 40 rupees

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Answer 2

s->selling price

c-> cost price

according to question

s=c-0.2c

s=0.8c............(1)

s+12=c+0.1c

s+12=1.1c

putting value of s from eqn 1

0.8c+12=1.1c

12=0.3c

c=12/0.3c

c=40 rupees

so cost price is 40 rupees