A local computer company sells three types of laptop computers to three nearby stores. The number of laptops ordered by each store and the amount owing to the company for the order is shown in the following table: Store Laptop A Laptop B Laptop C Amount Owing($) Wal Wart 10 21 200 Sears 7 18 700 Target 3 13 000 Write a system of equations to represent the above information and determine the unit price of each type of laptop computer