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

Ex Input:
Problem: a salt manufacturing company produced a total of 2000 tonnes of salt in january of a particular year . starting from february its production increased by 100 tonnes every month over the previous months until the end of the year . find its ave 66 rage daily production for that year ?

Ex Output:
83


Ex Input:
Problem: if each side of a square is increased by 20 % , find the percentage change in its area ?

Ex Output:
44 %


Ex Input:
Problem: in a certain pond , 35 fish were caught , tagged , and returned to the pond . a few days later , 35 fish were caught again , of which 2 were found to have been tagged . if the percent of tagged fish in the second catch approximates the percent of tagged fish in the pond , what ` s the approximate number of fish in the pond ?

Ex Output:

875