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Excerpts from Stafford Company's December 31, 2018 and 2017, nancial statements are presented below: 2018 2017 Accounts receivable $ 72,000 $ 52,000 Merchandise inventory 44,000 67,000 Net sales 285,200 270,000 Cost of goods sold 146,000 124,000 Total assets 457,000 421,000 Total shareholders' equity 272,000 241,000 Net income 56,500 44,000 [ Stafford's 2018 prot margin is (rounded): (Round your answer to 1 decimal places.)