AFCAT I 2013 Solved Paper

A man’s average monthly expenditure for the first four months of the year was ₹ 231.25. For the next five months,the average monthly expenditure was ₹ 22.75 more than what it was during the first four months. If the person spent ₹ 605 in all during the remaining three months of the year, find what percentage of his annual income of ₹ 3500 did he save in the year?