chetan2u wrote:

John sold a book for $50. If he made a profit of 25% on it, by how much should he increase the price if he wants to earn 50% on the book?

(A) $5

(B) $10

(C) $20

(D) $25

(E) $50

New question!!!..

Current price of the book \(= 50$\)

Let the initial price be\('x'\)

Profit of 25% i.e., \(50$ = x(1+25/100)\)

\(50$ = x (125/100)\)

\(x = 50/1.25\)

\(x = 40$\)

Initial price of book \(= 40$\)

To earn 50% profit \(= 40*(50/100) = 20$\)

Therefore, John needs to sell the book at \(= 40+20 = 60$\)

Current price \(= 50$\)

Price needed to increase \(= 60-50 = 10$\)

Hence B
_________________

Only those who risk going too far, can possibly find out how far one can go