A if a 10000 and i 25000 develop the demand

Question

Annual demand and supply for the Mylan company is given by:

Q_D = 5,000 + 0.5 I + 0.2 A - 100P, and Q_S = -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 = $10,000 and I = $25,000, develop the demand equation?

b. Given the demand curve in part a., what is equilibrium price and quantity?

c. If consumer incomes increase to $30,000, what will be the impact on equilibrium price and quantity?