A person used to get 15 litres of petrol for a certain amount but due to the hike in the price he is getting one litre less for the same amount What is the percentage rise in the petrol price ?
Let the amount that is fixed be 210 Rupees
He used to get 15 litres of petrol for Rs. 210 earlier and then only 14 litres.
Initial cost of petrol = 210/15 = 14 Rs
Final cost of petrol = 210/14 = 15 Rs.
% rise in petrol price = 100/14 = $$ 7 \frac {1}{7}$$
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