I need help figuring out what I think is an algebra problem, but I don't know how to set it up.

I have a population starting at 1.6 billion. The annual growth rate is 2%. The annual mortality rate is 0.6%.

The problem is this: In addition to the above parameters, there is a constant loss of 52,560,000 people per year.

How many years would it take for the population to drop to 620,000,000?

(also could you please show how you did it?)

Thanks!