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???3X????佫???3X????佫???????????????????6.???????????????佫????????????8???????????????????????20.5%???????70?????????6*8*1.205*70=4048.8?????????13???????4061.8

????4X????佫????????????????????7???佫??????????8?????????????????5.5%?????70???????7*8*1.055*70+35=4170.6

??5X?е???佫?????????????????7????5X????????????????0.5%??8???????70?????????

7*8*1.005*70+98=4037.6

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(6*1.205-7*1.005)=0.195*???*????-85(3X??5X??????????)??????????佫?????????????????????￡?5X???佫??????3X????佫???????????

??4X?????5X???佫????(7*1.055-7*1.005)=0.35*???*????-60

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