Question 2(a)

C(0) = 800, C(4) = 2,800, C(5) = 4,100.

Thus, there were 800 coffee shops in 1990, 2,800 in 1994, and 4,100 in 1995.

Question 2(b)

1992: 500 per year;

1995: 1,300 per year

Question 2(c)

1996