The details of a planned college course are as follows:
The budgeted number of students is 10. However, if a lower fee is charged, 20 students are likely to take the course.
How much should the course fee of ＄100 be reduced by to earn the same total profit from 10 students as from 20 students?
1 )
＄16
2 )
＄24
＄40
4 )
＄50
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