Please help me answer this

3 year(s) ago, Fatima invested 6,480 dollars. In 2 year(s) from today, she expects to have 8,430 dollars. If Fatima expects to earn the same annual return after 2 year(s) from today as the annual rate implied from the past and expected values given in the problem, then in how many years from today does she expect to have exactly 12,190 dollars? Round your answer to 2 decimal places