A recent computer market survey showed that, according to the percentage of student buyers of a brand to all buyers, A and B brand computers ranked the top two, the proportions were 68% and 52%
However, in the past 6 months in the ranking of the amount of computers purchased by students, the domestic C brand has always ranked first
The percentage of student buyers of a certain brand to the total number of student buyers of each brand is different from the percentage of student buyers of a certain brand to all buyers of the brand.