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ABC Company uses a perpetual inventory system and has the following inventory transactions: Units Unit Costs Total Costs March 1 Beginning 10,000 $9 $90,000 Inventory March 9 Purchases 12,000 $10 $120,000 March 12 Sales (20,000) March 18 Purchases 7,000 $77,000 $11 What is the weighted average cost per unit after the last purchase on March 18? (Round your answer to the nearest cent) a. $9.55 O b. $9.90 O c. $10.00 O d. $10.67