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

Example Input: Problem: a house wife saved $ 5 in buying an item on sale . if she spent $ 48 for the item , approximately how much percent she saved in the transaction ?
Example Output: 10 %

Example Input: Problem: how many numbers between 200 and 600 are divisible by 4 , 5 and 6 ?
Example Output: 6

Example Input: Problem: if a is a positive integer , and if the units digit of a ^ 2 is 9 and the units digit of ( a + 1 ) ^ 2 is 6 , what is the units digit of ( a + 2 ) ^ 2 ?
Example Output:
5