Ravi purchased a scooter at 11/13th of its marked price and sold it at 10% more than its marked price. His gain per cent is?

Let the MP of a scooter = ₹ P
∴ CP of a scooter= ₹ 11P/13, Gain = 10%
SP = (110/100) x P= ₹ 11P/10
Gain = SP - CP = (11P/10 - 11P/13) = (143P - 110P)/130 = ₹ 33P/130
Gain percentage = (33P/130) x (13/11P) x 100 % = 30%