Julia Roberts deposits 3400 dollars in an account paying an effective rate of interest of 6.4 percent. Three years later, she withdraws 1600 dollars. If there are no other transactions, how long will it take (from the time of the first deposit) for her account balance to reach 8400 dollars? (Assume simple interest between compoundings.)
Answer = years and days.
(Note: your answer for the number of years should be a whole number, while your answer for the number of days should be given to at least 3 decimal places.)