A man saves ` 200 in each of the first three months of his service. In each of the subsequent months his saving increases by ` 40 more than the saving of immediately previous month. His total saving from the start of service will be ` 11040 after

A man saves ₹ 200 in each of the first three months of his service. In each of the subsequent months his saving increases by $₹ 40$ more than the saving of immediately previous month. His total saving from the start of service will be ₹ 11040 after