one of ideas here is to plug numbers
total income of the family=100
mr lee income=0,6*100=60
income of the rest of the family=40 (40+60=100)
in june mr lee income increased by 20%=60*1.2=72
the income of the rest is the same=40
so total family income in june=40+72=112
the part of mr lee income in total income=72/112=0,64*100=64%
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Source: Beat The GMAT — Data Sufficiency |
