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)