Question

A person sold a book at 20% profit. If he had bought it at 10% less cost and sold for Rs 90 more then he would have gained and 40% profit find cost price of book.​

Answer 1

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Answer 2

Given :- A person sold a book at 20% profit. If he had bought it at 10% less cost and sold for Rs 90 more then he would have gained and 40% profit find cost price of book. ?

Solution :-

Let CP of book is Rs.100x .

so,

→ CP = Rs.100x

→ Profit = 20%

→ SP = CP * (100 + profit %)/100 = 100x * 120/100 = Rs.120x

and,

→ New CP = 10% less = Rs.90x

→ Profit = 40%

→ SP = (90x * 140)/100 = Rs.126x

A/q,

→ 126x - 120x = 90

→ 6x = 90

→ x = 15

then,

→ CP = 100x = 100 * 15 = Rs.1500 (Ans.)

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