Compound Interest and the TVM Calculator Use the TVM Calculator to solve the following cirmpound interest problem. Round your result to two decimal places as needed. You invest $12,000 in an account. The interest is compounded monthly for 12 years. The account balance will be $36,042.40 at the end of 12 years. What is the annual interest rate? Enter the values you need to put in the TVM calculator. Put the letter x for the unknown value. Remember that money paid to the bank is negative and money received from the bank is positive. Use the link to the TVM Calculator below to solve the problem. The annual interest rate is TVM Calculator