In each of the following scenarios, categorize the price elasticity of demand as elastic, inelastic or unitary elastic. Where calculations are required use average price and quantity.

a. The price of 4K TVs falls from $ 2750 to $ 2250 and the quantity demanded increases from 40 000 to 60 000 units.

b. Canada Post increases the price of a stamp from 52 cents to 54 cents, but its total revenue remains the same.

c.The quantity demanded falls from 3500 to 2800 units. The price increases from 50 to 60 dollars.