Managerial Economics & Business Strategy 7th Edition by Michael Baye, Stanley Brue, David MacPherson

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Suppose the demand function for a firm's product is given by
Where
a. Determine the own price elasticity of demand, and state whether demand is elastic, inelastic, or unitary elastic.
b. Determine the cross-price elasticity of demand between good X and good Y, and state whether these two goods are substitutes or complements.
c. Determine the income elasticity of demand, and state whether good X is a normal or inferior good.
d. Determine the own advertising elasticity of demand.