(c) Let the price paid per trip by a passenger be ₹ x. and auto rickshaw consumes y L petrol Total expenditure in a trip = 3O × y = ₹ 30y Total earning in a trip = 3 × x = ₹ 3x According to the question, 3x - 30y = 20% of 30y ⇒3x-30y =
20×30
100
y ⇒3x - 30y = 6y ⇒ 3 = 36y ⇒ x= 12y Now, the price of petrol are reduced to ₹ 24 and passenger taken by auto-rickshaw are four. ∴ Total expenditure in a trip = 24 x y = ₹ 24yTotal earning in a trip = 4 × x = ₹ 4x Profit percent =