There must be a problem with the plan, and there must be others

There must be a problem with the plan, and there must be others

[plan question] 1. A company decided to distribute 10 computers to Party A and 8 computers to Party B, but now there are only 12 computers. It needs to buy 6 computers from the market. After negotiation, the freight for transporting one computer from the company to Party A and Party B is 50 yuan and 30 yuan respectively, and the freight for transporting one computer from the market to Party A and Party B is 80 yuan and 40 yuan respectively. The total freight is required to be no more than 840 yuan