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.)