After graduating from college, you are hired by the Ford automobile company as an economic analyst. For your first project, you are asked to estimate what would happen to the sales of Ford Mustangs as a result of a change in (i) the price of a Chevrolet Camaro, (ii) the price of gasoline, and (iii) consumer incomes. You are given the following elasticities:

price elasticity Of demand for Ford Mustangs= -2.5
Cross-price elasticity between Ford Mustangs and Camaros =1.5
Cross-price elasticity between Ford Mustangs and gasoline= -0.80
Income elasticity of demand for Ford Mustangs= 3.00

a. Suppose the price Of a Camaro falls by 10%. With all else being equal, sales of Ford Mustangs would__ by_%
b. If the price of gasoline increases by 20%, the quantity of Ford Mustangs would _by_%

Camaro and ford mustangs would be considered as a substitute goods as the cross price elasticity of demand comes in positive so in the case when the price of camaro decrease so the quantity of Mustang would also decreased by 1.5 ×10% = 15%

b. As we know that Gasoline and mustang would be considered as complementary goods so if the price of gasoline would increase by 20% so the quantity of mustang be decreased by 0.80 × 20% = 16%