Presume the own price elasticity of demand for good X is -5, its income elasticity is 1, its advertising elasticity is 3, and the cross-price elasticity of demand among it and good Y is 4. Decide how much the consumption of this good will change if:
1. Income increases by 4 percent.
2. Advertising decreases by 2 percent.
3. The price of good X decreases by 5 percent.
4. The price of good Y increases by 8 percent.