I need help with the following question pleaae

Mr Bill S. Preston, Esq, purchased a new house for $60.000. He paid $30.000 upfront and agreed to pay the rest over the next 15 years in 115 equal annual payments that include principal payments plus 12 percent compound interest on the unpaid balance. What will these equal payments be? Mr Bill S Preston Esq, purchased a new house for $60.000 and paid $30.000 upfront. How much does he need to borrow to purchase the house