30. Wood Company pays each of its three salespeople a base salary of $300 per month plus a commission of 10 percent of monthly sales. The base salary is paid each month as incurred; the 10 percent commission is paid the month following the month of sale. The total sales for the past three months are as follows: October November December $15,000 20,000 30,000 Total salary and commission cash disbursements for December add up to a. $2,900. b. $2,600. c. $3,900. d. $2,000.