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题库 / OG2017Q-PS-39
The organizers of a fair projected a 25 percent increase in attendance this year over that of last year, but attendance this year actually decreased by 20 percent. What percent of the projected attendance was the actual attendance?
45%
56%
64%
75%
80%
题目分析：
假设去年参加人数是 A，今年实际参加人数就是(1-20%)A，预计今年参加的人数是(1+25%)A.所求比例就是(1-20%)A/(1+25%)A=0.8/1.25=64%。
综上：答案就是 C.
What percent of the projected attendance was the actual attendance? 这不是再问预计是实际的%吗，所以我认为题错了。
同问，不应该是1.25/0.8吗？
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Last year attendance = 100 (assume);
Projected Attendance = 125;
Actual Attendance = 80.
The actual attendance therefore was (Actual)/(Project) = 80/125 *100 = 64$ of the projected attendance.
（1-0.2）/（1+0.25）=0.64