Thong opened a compound interest account. He made an initial deposit of $1,280. The account pays him 3.6% annual interest and is compounded annually. If Thong doesn't make any other deposits into this account, how many years will it take for the balance in Thong's account to be $2,000? Here is the Balance Function for a compound interest account. B left parenthesis t right parenthesis space equals space P times open parentheses 1 plus r over n close parentheses to the power of n times t end exponent Round your answer to the nearest tenth of a year. Input only the number. For example: 10.3