Question

(a) Secondhandbook.com, the online book store in HappyLand, wants to increase its total revenue. In the first week of a new semester, Secondhandbook.com offers a 10% discount on every book it sells. Secondhandbook.com knows that its customers can be divided into two different groups according to their likely responses to the discount. The following table shows how the two groups respond to the discount.

Group One Group Two (sales per week} (sales per week) Volume of sales before m Volume of sales after 1.70 million -- Price of Hamburger Quantity of Hamburger Quantity of Hamburger ($) Demanded Supplied 10 O 6 9 1 5 8 2 4 3 3 6 4 2 5 4