Three friends, Chen, Qu, and Lin, are trading videogames among themselves. Chen wants to buy three new videogames in week 1 and four in week 2. Qu is willing to sell only five videogames for a price of 300 HKD each this week and 270 HKD each next week. Lin, on the other hand, can only sell four videogames for 290 HKD each this week and 280 HKD each next week.

Chen is investigating solutions to buy his seven videogames at the minimum cost. What is the optimal solution for him?

a. Write a linear programming model.

b. Use Excel Solver or other software to determine the solution that will minimize the costs for Chen. LO.1