Models and numerical methods.

Suppose that the number of turtles n(t) with t in years) on a remote island satisfies the differential equation dn/dt = 0.00025n^2-0.02n
A) If there are initially 40 turtles on the island, solve this differential equation to determine what happens to the turtle population in the long run >
B) Repeat part ( a) but with 100 turtles initially
NB: I need step by step please, as well please take care those questions because 15 days ago all the four questions I sent were incorrect.