Please show how to solve in simplest way with work [multi part question]

Jared has decided that he wants to build enough retirement wealth that, if invested at 8% per year compounded monthly), will provide him with $3,500 of monthly income for 30 years. To date, he has saved nothing, but he still has 25 years until he retires. How much money does Jared need to contribute per month to reach his goal? Solution: S501.56 Audrey placed $300 into her savings account five years ago. Today she has $500 in her account. What interest rate has the bank been paying her? (Assume annual compounding) Solution: 10.76% Pauline just placed $500 into an investment which pays 6% compounded annually. How long will it be before she has $800 in the account? Solution: 8,0661 years or 8 years 24 days Donald places $1,000 into an investment which pays 6% compounded quarterly. How much will Donald's investment be worth after three years pass? Solution: S1,195.62