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【单选题】
某公司标准工资率为 15 元 / 小时,标准工时单耗 8 小时。本月实际生产产品 100 件,实际使用工时 1000 小时,支付工资 15500 元,则直接人工的成本差异为( )元A.
500
B.
4000
C.
3000
D.
3500
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