If 20 percent of the students at a certain school went to a camping trip and took more than $100, and 75 percent of the students who went to the camping trip did not take more than $100, what percentage of the students at the school went to the camping trip?	Answers:  A) 95  B) 90  C) 85  D) 80  E) 75
Let x be the number of students in the school. 0.2x students went to the trip and took more than 100$. They compose   (100-75)= 
<gadget id="calculator">  (100-75)</gadget>
<output>25</output>
25% of all students who went to the trip. Therefore the toal of 0.2x/0.25=0.8x students went to the camping which is 80%.   The answer is 80  0.2 /0.25= 
<gadget id="calculator">  0.2 /0.25</gadget>
<output>0.8</output>
0.8x students went to the camping which is 80%.   The answer is 80
<result>D</result>
If 20 percent of the students at a certain school went to a camping trip and took more than $100, and 75 percent of the students who went to the camping trip did not take more than $100, what percentage of the students at the school went to the camping trip?