Online buyers as use of the internet grows so does the

Question

Question: ONLINE BUYERS As use of the Internet grows, so does the number of consumers who shop online. The number of online buyers, as a percent of net users, is expected to be

P(t) = 53t^0.12            (1 ≤ t ≤ 7)

where t is measured in years, with t = 1 corresponding to the beginning of 2002.

a. How many online buyers, as a percentage of net users, were there at the beginning of 2007?

b. How fast was the number of online buyers, as a percentage of net users, changing at the beginning of 2007?