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The first volume of sixth grade mathematics-please help at a discount! Emergency, emergency, emergency, emergency
Solution:

1.540/0.6=900

424/0.8=530

A: 300*0.9*22=5940

B: 300*20=6000。

A: 540-200=340

B: 540*0.6=324

50% off, not all.

160/200=0.8

20% discount

5.50 is less than 300

Or a 10% discount

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