On an Average Day,Tennis R Us Writes Checks Totaling $2,000

On an average day,Tennis R Us writes checks totaling $2,000. These checks take 3 days to clear. The company receives checks totaling $1,800. These checks take 2 days to clear. The cost of debt is 8%. What is the firm's net float?

A) $-2,500
B) $-2,400
C) $2,400
D) $2,500
E) None of these.