Find the final amount in the following retirement? account, in which the rate of return on the account and the regular contribution change over time. ?$480 per month invested at 5?%, compounded? monthly, for 6 ?years; then ?$582 per month invested at 7?%, compounded? monthly, for 6 years.
What is the amount in the account after 12 ?years?? ?(Round to the nearest dollar as? needed.)