The quantity demanded of a certain product, q, is given in terms of p, the price, by q=1000exp(-0.04p). Write revenue, R, as a function of price. a) R(p) = 1000exp(-0.04p) b) R(p) = 40,000 - 1000exp(-0.04p) c) R(p) = 40,000 - 25p d) R(p) = 40,000exp(-0.04p)