Mike is planning to retire in $32$ years. He is thinking about opening a retirement account and plans to invest an equal amount each year into the account. He expects to earn $10\mathrm{.}5\%$ per year in the account and is planning to have $$1,500,000$ in the account at retirement, what is the amount of Mikes annual investment?$$7,922$$$6,728$$$5,387$$$4,727$None of the above