Calculating Maximum Supportable Loans.

Can anyone show me how to solve this? my homework is nothing but these questions and im stuck!

Calculate the new loan amounts and the capital that can be raised from each proposed refinancing. Assume a target DSCR of 1.15 for all new loans. 1. Walnut Creek Apartments has an outstanding loan balance of $2,371,280. NOI (after reserves of $30,000 ) is $315,000. New financing is available at 6% interest with 30 -year amortization. What is the size of the maximum loan, and how much cash will be left after repayment of the old loan