Muscat Company uses the periodic inventory system to account for inventories. Information related to Muscat Company's inventory for the month of January 2020 is given as follows: Units Per unit price Total Balance, 1/1/20 200 OMR 5.00 Purchase, 1/15/2020 100 5.30 Purchase, 1/28/2020 100 5.50 The physical inventory count on January 31 shows 120 units are on hand. Using the FIFO method, what is the cost of goods sold? Select one: O a. OMR 600 O b. None of the answers are correct c. OMR 656 d. OMR 1,424 e. OMR 520