Answer:
almost 15.5 years
Step-by-step explanation: let the population will be reached in t years
17000+(17000x2.5%xt) = 23600
or, 17000 x (1+ 2.5% x t) = 23600
or, 1+ 2.5% x t = 23600/17000
or, 1+ 2.5% x t = 236/170
or, 2.5% x t = 236/170 - 1
or, 2.5% x t = 66/170
or, t = 66/(170 x 2.5%)
t= 15.529