Indian Institute of Foreign Trade 2009 Solved Paper

Dinesh joined on July 1, 2008 in the pay scale of Rs. 16,400-20,000 at the basic pay of Rs. 16,850. On August 10, 2009, the department revised the rates of DA to 31% with effect from January, 2009 and further to 36% effective from July 2009. How much arrears will Dinesh get in August, 2009 because of these revisions?