The task is to generate the correct answer for a given math problem.

Example Input: Problem: every year an amount increases by 1 / 8 th of itself . how much will it be after two years if its present value is rs . 70400 ?
Example Output: 89100

Example Input: Problem: a reduction of 20 % in the price of oil enables a house wife to obtain 4 kgs more for rs . 600 , what is the reduced price for kg ?
Example Output: 30

Example Input: Problem: if a train , travelling at a speed of 90 kmph , crosses a pole in 4 sec , then the length of train is ?
Example Output:
100