Suppose the own price elasticity of demand for good X is -3, its income elasticity is 1, its advertising elasticity is 2, ans the cross price elasticity of demand between it and good Y is - 4. Determine how much the consumption of this good will change if :

a.The price of good X decreases by 5%?

b.The price of good Y increases by 8%?

c.Advertising decreases by 4%?

d.Income increases by 4%?