(a) Consider the following information for a product A and a related product B in consumption:

Quantity of A traded	Price of A	Income of Consumers	Price of B
1,200	$1.00	$10,000	$1.00
1,800	$0.90	$8,000	$0.80

(i) Determine the price elasticity of demand for product A, the income elasticity of demand for product A and the cross-price elasticity of demand between product A and product B using the mid-point formula. Based on the elasticities, explain how you classify product A in terms of its price and income elasticities of demand and also the relationship between product A and product B.

(ii) Given that the price of product A decreases by 5%, consumers' income decreases by 3% and the price of product B increases by 4%, compute the effect on the revenue from product A, assuming each change occurs separately.