First you take a protractor and a pencil next, you draw a horizontal line (red) then find the value of the angle, and draw a line with the matched value (green) please look at the image
Let the number of years after 2001 be x, then 1280000 + 19500x = 1700000 19500x = 1700000 - 1280000 = 420,000 x = 420000/19500 = 22 years. x = 22 years.
