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?49?????20+50+75+100+125+150+175+200+225+250=1345.

50??54??55×5=275

55??59??60×5=300

60??64??65×5=325

65??69??70×5=350

70??72??75×3=225

????????1345+275+300+325+350+225=2820

?????????????????????????￥??t???????2820. ???????????????????????????????????

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