请教GMAT数学题一道
29.AcomputerchipmanufacturerexpectstheratioofthenumberofdefectivechipstothetotalnumberofchipsinallfutureshipmentstoequalthecorrespondingratioforshipmentsS1,S2,S3andS4combined,asshowninthefollowingtable.Whatistheexpectednumberofdefectivechipsinashipmentof60,000chips?
ShipmentNumberofdefectivechipsintheshipmentTotalnumberofchipsintheshipment
S125,000
S2512,000
S3618,000
S4416,000
a)14b)20c)22d)24e)25
所给答案是b.
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