calculus problem

Franchise expansion. Pete Zah's, Inc., is selling franchises for pizza shops throughout the country. The marketing manager estimates that the number of franchises, N, will increase at the rate of 10% per year, that is, dp at 0.10N a) Find the function that satisfies this equation. Assume that the number of franchises at t = 0 is 50. N(t) = b) How many franchises will there be in 20 yr? Number of Franchises = Round to the next whole number c) In what period of time will the initial number of 50 franchises double