Percentage
The percent favoring at least one of the proposals is NOT the sum of 50, 30, and 20 because someone favoring 2 of the proposals will be counted twice and someone favoring all three will be counted 3 times. The correct relation is 78 = 50 + 30 + 20 - (percent favoring 2 of the proposals) - 2(percent favoring 2) - 2(5), which can be solved to give the percentage favoring 2 of the proposals or
100 - 10 - 78 = 12. Therefore the percentage favoring more than one proposal is 12 + 5 = 17.
MOCK TEST SERIES