A.The price of apples rises from $2 to $3 per kilogram, while the quantity demanded falls from 1200 kilograms to 900 kilograms.

i. Use the midpoint formula to calculate the price elasticity of demand.

ii. Calculate the total revenue both before and after the price change. Comment on the relationship between the elasticity of demand and changes in total revenue.

B. Hassan's income rises from $20,000 to $24,000 and the quantity of chicken he buys each week falls from 2 kilograms to 1 kilogram. Calculate the income elasticity of demand using the midpoint formula and comment on whether the good is normal or inferior.

C. The price of mangoes rises from $2.00 per kilogram to $3.00 per kilogram. As a result, the quantity of bananas demanded rises from 8,000 dozens per week to 9,500 dozens. Calculate the cross-price elasticity using the midpoint formula. Are the goods substitutes or complements?