During year 20X5 ABC company purchased 3,000 of merchandise against cash and 2,000 with notes payable. The opening and closing inventory for 20X5 were 600 and 300 respectively. Which of the following is correct? a. The cost of sales is 3,600 b. The cost of sales is 5,000 c. The cost of sales is 5,300 d. The cost of sales is 5,600 e. None of the above is true