Question

My mother says, in her childhood petrol was $Rs.1$ per litre. It is $Rs.65$ per litre today. By what percentages has the prices of petrol gone up ?

Answer 1

Some years past, rate of petrol $=Rs.1$ per litre
Present rate $=Rs.65$ per litre
Increase $=\frac{65}{1}\times 100=6500\%$