[計量]補習班練習題
tickets for all but 100 seats in a 10000-seat stadium were sold. Of the
tickets sold, 20 percent were sold at half price and the remaining
tickets were sold at the full price of $2. What was the total revenue
from ticket sales?
A. $15840
B. $17820
C. $18000
D. $19800
E. $21780
不知道是我意思理解錯誤還是忽略了哪裡，我算出來的答案沒有在選項裡
拜託各位高手幫我解釋一下題目，謝謝
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