Problem 3 Your company has decided to purchase new desk chairs for its 30 employees after discovering they have a budget surplus. The table below gives both the unit price of a chair, as well as the minimum number of chairs that must be purchased to qualify for that price. A B с D Unit price 500 450 300 425 Min. order 1 7 20 10 a. How can the company minimize the cost of buying everyone new chairs? b. If in addition to the unit cost per chair, each supplier applies a fixed shipping charge, fs, how the model change?