The demand for hamburgers at the Ye aide College Diner is a function of both the price of the hamburgers and the number of months since the beginning of the school year, as shown by the function QD = e4p-0.25e-0.125t ‘where QD is quantity demanded, P is the price of hamburgers is the number of months since September (so t =0 in September, t = 1 in October, and so forth).
(a) Show how the demand for hamburgers varies with their price in September, January & May.
(b) Show how the demand for hamburgers varies with the number of months since September, for a given price of hamburgers.