The price of Chrysler stock increased on 30% of the trading days over the past year.The price of Ford stock increased on 40% of the trading days over the past year.On 60% of the days when the price of Ford stock increased, the price of Ford stock increased as well.On what proportion of the days did exactly one of the stocks increase in price?
A).22
B).88
C).40
D).12
E).24

Question

Quizplus · Accepted Answer

The price of Ford stock increased on 40% of the trading days over the past year. On 60% of the days when the price of Ford stock increased, the price of Ford stock increased as well. So, the price of Ford stock increased on 40% * 60% = 24% of the trading days over the past year. The price of Chrysler stock increased on 30% of the trading days over the past year. So, the price of exactly one of the stocks increased on 40% + 30% - 24% = 46% of the trading days over the past year.

The Price of Chrysler Stock Increased on 30% of the Trading