1. Given the demand function:

Qd=100-P-4PA+3Y

whereP= the price of the good,PA= the price of an alternative good andY= income

If P=4, PA=8 and Y=60 find:

a. the price elasticity of demand

b. the cross-price elasticity of demand

c. the income elasticity of demand

If income increases by 5%, calculate the corresponding change in the quantity demanded.

Is the good inferior or superior?

thank you all for your help.