Please answer these questions completely and thoroughly.

1. Briefly discuss why the negative sign is usually ignored when computing for price elasticity of demand.
2. Briefly explain the effect of price elasticity of demand to the total revenue. Cite an example.
3. Compute the total revenue and price elasticity of demand . Use the formula for point elasticity.

Points Price Qty Demanded

A 50 150

B 45 200

C 40 250

D 35 300

E 30 350

F 25 400

G 20 450

H 15 500

I 10 550

Please add a fourth column for Total revenue and a fifth column for Price Elasticity of Demand

1. The income of Mr. De la Cruz increased from P300 to P450 a day. His demand for grocery items increased from 200 to 500. Compute for his income elasticity of demand.
2. The price of product A increased from P20 to P40. The demand for Product B went up from 100 to 200. Calculate the cross elasticity of demand.