13. The firm receives an average of $20,000 in checks per day. The weighted average delay in clearing the checks received is 3 days. Meanwhile, the firm writes an average of $17,000 in checks to pay its suppliers per day. The usual clearing time for the checks the firm wrote is 2 days. The current interest rate is 0.015 percent per day. What is the most the firm should be willing to pay today (in a lump sum today) to eliminate its float entirely? A) 3000 B) 26000 C) 34000 D) 37000 E) 60000