The population of a certain city is increasing exponentially according to the differential equation (1? : Icy, where y(t) is the number in the population at time t. In 1980, there were 2 million in the population. Twenty years later, in 2000, the population was 3 million. Find the value of the growth constant 1:. 111(2/3) 20 111(3/2) 20 111(3/2) C. O 2000 GA. QB