Can someone help me with this calculus ques?

Suppose that the population of a region at the start of 2006 was 3.6million people and at the start of 2008 the population was 4.8million people.Let P denote the population of the region(in millions) at time t with t=0 corresponding to the beginning of 2006.uming that the population growth is exponential,in what year will the population of the region reach 7millions.