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哪位好心人教教我怎么做！
A factory worker produced one lot of connecting clips, and initial quality control found that 5/7 of clips in the lot could be used. An assembly plant purchased this lot of clips valuing the lot at $3 per each usable clip. During assembly, it became known that only 3/5 of the clips in the lot were usable. What was price per usable clip that the assembly plant paid for the lot?
- A 2 1/7
- B 3 4/7
- C 5 1/4
- D 5
- E 6 3/8
A的意思是 2又7分之1
正确答案 B |
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