The price of all rail season tickets to London increased by 4%. The price of a rail season ticket from Cambridge to London increased by 121.60. work out the price before this increase.

Percentage increase in the rate of all rail season tickets to London = 4%

Price of the rail ticket from Cambridge to London increased by = 121.60

Let us assume the price before the increase in the fare = x

Then

4% * x = 121.60 dollars

(4/100) * x = 121.60 dollars

x/25 = 121.60 dollars

x = 25 * 121.60 dollars

= 3040 dollars

So the price of the ticket from Cambridge to London before the increase in price was 3040. I hope the procedure is simple enough for you to understand.