### Calculating income elasticity of demand advertising elasticity

Suppose you have the following hypothetical demand or sales function. Qx= -4Px+2Py+0.20I+0.04A and PX = $200, (price of good X) PY =$230, (price of good Y) I = $1,500 (disposable per capita income) A =$12,000 (advertizing expenditures) 1. Calculate the income elasticity of demand for product X when I= $1,500. How c