The selling price of a desktop is 9 times of the profit earned on selling this desktop. What is the profit percentage?

12.5%

The selling price of a desktop is 9 times of the profit earned on selling this desktop.

SP = 9(SP-CP)

SP = 9SP-9CP

9CP = 9SP-SP

9CP = 8SP

\(\frac{CP}{SP}\) = \(\frac{8}{9}\)

Profit % = (9 – 8) × \(\frac{100}{8}\) = 12.5%