On October​ 1, 2019, Westfield Company sold machinery to a customer for​ $21,000. The customer could not pay at the time of​ sale, but agreed to pay 10 months​ later, and signed a​ 10-month note at​ 12% interest. How much interest revenue was earned during​ 2019? Round any intermediate calculations to two decimal​ places, and your final answer to the nearest dollar.