Rhonda deposits $A in an account with an effective interest rate of 6.2%. At the same time, she also deposits $B into another account with an effective interest rate of 7.2%. After 8 years have passed, the combined total in the two accounts is $54000. In another 2 years, the balance in the account paying 7.2% is three times that of the other account. What is the balance in the account with 6.2% effective interest 12 years after the initial deposit?
Answer = $ (Round your answer to four places after the decimal.)