A shopkeeper buys two books for Rs.300. He sells the first book at a profit of 20% and the second book at a loss of 10%. What is the selling price of the first book, if, in the whole transaction there is no profit no loss?
Answer & explanation
Correct answer: option 3
Using allegation method,
20% 10%
0%
10 : 20
= 1 : 2
1 + 2 = 3 unit
= 3 unit = 300
= 1 unit = 100
CP of the first book = 100