天山新題5-24

[vivid]

User-friendly 56%
Fast response time 48%
Bargain prices 42%

The table gives three factors to be considered when choosing an Internet service provider and the percent of the 1200 respondents to a survey who cited that factor as important. If 30% of the respondents cited both "user-friendly" and "fast response time," what is the maximum possible number of respondents who cited "bargain prices," but neither "user-friendly" nor "fast response time"?

A 312
B 336
C 360
D 384
E 420

ANS A

煩請大大解惑
謝謝

[homaru]

56%+48%-30%=74%
100-74%=26%<42%
26%*1200=312