一道微观经济问题,应该.A monopolistically competitve profit-maximizing

一道微观经济问题,应该.
A monopolistically competitve profit-maximizing firm is producing and selling 2000 units of output.At this output level,marginal revenue is $9,average revenue is $10,and the average variable cost is $8.The product price is (
大概就是说一个垄断竞争的公司,生产2000个产品,边际收入是九元,平均收入是十元,平均可变成本是八元,请问产品的单价是多少