A city's population is $$p$$ and increasing at a rate $$r$$ every year. For example Antalya's population was 1.800.000 in 2008 and increased at a rate of 0.12 (i.e. 12%) every year.
Write a function to find expected population in $$n\ge 0$$ years from now given current population $$p\ge 0$$ and increase rate $r <ge 0$.