Question $19$

Let's return to $20-$year$-$old you. You're working, but aren't worried about saving for retirement. You're young! You've got plenty of time. Fast forward to $35-$year$-$old you. You decide perhaps it's time to think about the future and begin saving for retirement. Suppose you deposit $$\frac{300}{?}$ month into a retirement account earning $6\%$ interest, just like in the previous scenario. You continue to make deposits until retiring at age $65.$ How much is in your retirement account when you retire?