Nile.com, the online bookstore, wants to increase it''s total revenue. One strategy is to offer a 10% discount on every book that sells. Nile.com knows it''s customers can be divided into two groups according to their responses to the discount. The accompanying table shows how the two groups respond to the discount.
Volume of sales before the 10% discount
Group A (Sales Per Week)1.55 million
Group B (Sales Per Week)1.50 million
Volume of sales after the 10% discount Group A (Sales per week)= 1.65 million Group B (Sales Per Week)= 1.70 million
Question: Using midpoint method, calculate the price elasticities of demand for Group A and Group B