You are informed that own price elasticity of demand for milk is -1.0 and the equilibrium quantitiy and price are 100ton and 1000won/kg.

Using these information, the milk demand curve is P=2000-(1/100)Q

Question: Some recent research showed that milk demand is influenced by the prices of yogurt and cheese as well as personal income. If the elasticies of milk demand with respect to the prices of yogurt and cheese are 0.2 and 0.3, what is the income elasticity for milk demand? Explain