The gross national income (GNI) of a certain country (in billions of US. dollars) can be approximated by f(t) = 10353016\" (a) Find f'(t). (b) At what rate was the GNI changing in 2000? (c) Repeat part (b) for 2004. , where t= 0 corresponds to the year 2000. E> (a) rm= [i (b) In 2000, the GNI was changing at a rate of about $E| billion per year. (Round to the nearest integer as needed.) (c) In 2004, the GNI was changing at a rate of about 55': billion per year. (Round to the nearest integer as needed.)