Q = 8-2P+0.10I+Px
Where Q is quantity demanded,
P is the price of the product,
I is income, and
Px is the price of a related good.
Assume that P=$10, I=100, and Px=20.
Using the following equation for the demand for a good or service,
a) Calculate the price elasticity of demand
b) Calculate the income elasticity of demand