?????????????????????2w?? ???????????????? ?????????????????

????:???????????2W??????????????????????????Σ??????????

???湫?????巽????

??ο????????????4??????????????40??????????С????50????????90???

????????????????????????

???????20???

???20?????200??????100???5?ζ????????70???2?η???????1?????500??OK????????

???20???????10??????

????????????????????????? 40+50+10=100??????

?????????????????100*4=400??????

?????RMB?????????????? 20*4=80???

???????????????????湻 5?ο??????????

????5?ο?????????

5*400=2000?????

????RMB???? 80*5=400?!

?????????Σ????ж??????????? 2000????=2000*10=20000?????????????п????

???е????4?????10??????4*10=40????=40*10=400?????

?????????20000+400=20400?????????????? 400?RMB

???????????????????????2?ο?????????????????????2?????￡????????20400?????????????400?????!!

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