Vacations-R-Us.com, the online cruise seller, wants to increase its total revenue. One strategy is to offer a 10% discount on every cruise it sells. Vacations-R-Us.com knows that its customers can be divided into two distinct groups according to their likely responses to the discount. The accompanying table shows how the two groups respond to the discount.
Group A Group B (sales per week) (sales per week)
Volume of sales before the 10% discount 1.55 million 1.50 million
Volume of sales after the 10% discount 1.65 million 1.70 million
a. Using the midpoint method, calculate the price elasticities of demand for group A and B.
b. Explain how the discount will affect total revenue from each group.