A business is registered for sales tax. The sales tax rate is 20%. Sales （including sales

business is registered for sales tax. The sales tax rate is 20%. Sales (including sales tax) for the period are $37,200 and purchases (excluding sales tax) are $19,600. What is the balance on the sales tax control account？
A、$3,920
B、$6,200
C、$3,760
D、$2,280