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7. (10 pts) An annuity has payments at the end of every month for 40 years. For the first year, the monthly payments are $ 100 each. For each subsequent year, the payments increase by $20, so the payments in the second year are all $120, the payments in the third year are all $140, etc. The nominal interest rate is 9% compounded monthly. Find the accumulated value of this annuity at the time of the last payment. Show all work. 7. (10 pts) An annuity has payments at the end of every month for 40 years. For the first year, the monthly payments are $ 100 each. For each subsequent year, the payments increase by $20, so the payments in the second year are all $120, the payments in the third year are all $140, etc. The nominal interest rate is 9% compounded monthly. Find the accumulated value of this annuity at the time of the last payment. Show all work