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????????200??A+C????100%+50%+B%??+??100000-200??A+C????*??100%+50%??

=2??A+C????150+B??+??1000-2??A+C????*150

=2??150A+AB+150C+BC??+150000-300A-300C

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=150000+2AB+2BC

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=2A??150+B+C??+??1000-2A??*150

=300A+2AB+2AC+150000=300A

=2AB+2AC+150000

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