A breeder reactor converts stable uranium-238 into the isotope plutonium-239. The decay of this isotope is given

Question:

A breeder reactor converts stable uranium-238 into the isotope plutonium-239. The decay of this isotope is given by
A(t) = A0e-0.00002876t
where A(t) is the amount of isotope at time t, in years, and A0 is the original amount. This isotope has a half-life of 24,101 years (that is, half of it will decay away in 24,101 years).
(a) At what rate is A(t) decaying at t = 24,101 years?
(b) At what rate is A(t) decaying after 1 year?
(c) Is the rate of decay at its half-life greater or less than after 1 year?