In each case below, determine the effect on the sellers' total revenue and identify whether the demand curve in this particular market is elastic, inelastic, or unit-elastic in the relevant price range.

a. When the price per package of a brand of chocolate chip cookies increases from $3 to $4, monthly quantity demanded decreases from 20,000 to 14,000 packages.

Initial total revenue is $and final total revenue is $. Demand is

(Click to select)

unit-elastic

elastic

inelastic

.

b. A fall in the price of sugar from $5 to $4 per carton raises weekly quantity demanded from 25,000 to 30,000 cartons.

Initial total revenue is $and final total revenue is $. Demand is

(Click to select)

elastic

inelastic

unit-elastic

.

c. A rise in the quantity demanded of a monthly fashion magazine from 35,000 to 40,000 copies occurs when its newsstand price is reduced from $9 to $8.

Initial total revenue is $and final total revenue is $. Demand is

(Click to select)

inelastic

elastic

unit-elastic

.

d. Daily quantity demanded of a particular model of earphones rises from 2,000 to 2,400 earphones if the price drops from $180 to $150.

Initial total revenue is $and final total revenue is $. Demand is

(Click to select)

unit-elastic

elastic

inelastic

.