Annual demand and supply for the Entronics company is given by:
QD = 5,000 + 0.5 I + 0.2 A - 100P, and QS = -5000 + 100P
where Q is the quantity per year, P is price, I is income per household, and A is advertising expenditure.
a. If A = $15,000 and I = $45,000, what is the demand curve?
b. Given the demand curve in part a above. what is equilibrium price and quantity?