Please use formulas

1. Mr. Bill S.Preston purchased a new house for $100,000. He paid $20,000 upfront on the down payment and agreed to pay the rest over the 25 years in 25 equal annual payments that include principal payments plus 8 percent compound interest on the unpaid balance. What will these equal payments be? 2. What is the present value of an annuity of $90 received at the beginning of each year for the next six years? The first payment will be received today, and the discount rate is 8% 3. Red Sea Co. obtained a $200,000 loan from ANB bank at 6% annual interest rate that will be paid off in annual payments over ten years. How much will each annual payment be? 4. As a result of winning the Gates Energy Innovation award, you are awarded a growing perpetuity. The first payment will occur in a year and will be for $20,000. You will continue receiving monetary awards annually, with each award increasing by 4 percent over the previous award, and these monetary awards will continue forever. If the appropriate interest rate is 10 percent, what is the present value of this award