Sales analysis A company's total sales (in millions of dollars) t months from now are given by S(t) = 0.015t^4 + O.4t^3 + 3.4t^2 + 10t - 3 (A) Find S'(t). (B) Find S(4) and S'(4) (to two decimal places). Write a brief verbal interpretation of these results. (c) Find S(8) and S'(8) (to two decimal places). Write a brief verbal interpretation of these results