[单选题]Jewelers uses the perpetual inventory system. On April 2, Michelin sold merchandise with a cost of $5,500 for $9,000 to a customer on account with terms of 3/15, n/30. On April 4, the customer reported damaged goods and Michelin granted a $1,000 sales allowance. On April 10, Michelin received payment from the customer. Calculate the amount of net sales revenue.