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?

(A) 95

(B) 90

(C) 85

(D) 80

(E) 75

95% OA A

ReplyDeleteI think it is D... 80%

ReplyDeletelet total students be = t

let the students going on trip = s

20% of t = 25 % of s (as, 75% didn't take more than $100)

simple calculation gives us,

s/t = 80%

Excellent problem. completely bowled me out. Answer is 80%

ReplyDeleteStud Attend camping SANot Camp

ReplyDelete> 100 20

< 100 .75 X

Total X 100-x 100

20 +0.75 X = X

X = 80

Ans D ...easy

total # students=t

ReplyDeletetrip =e

.25e=.2t

e/t *100 = 80