1.

A salesman calculated his profit on the marked price and finds it to be 30%. He forgets the fact that he gave a discount of 20%. What is his actual profit percentage?

Answer»

A. 100/7%
B.18.4%
C.260/11%
D. 22.5%

Solution :Total sutdents =2000
Let, STUDENTS appear in exam C only =a
Total students appeared in exam B=720
Ratio of number appeard in exam B and C only =`2:3`
Students appeared in exam A andC both =a/2
Numberof students appeared in all THREE exams
`=(4)/(100)xx2000=80`
Number of students appeared in B exam only = No. ofStudents appeared in B and C only = 3x
Number of students appeared in exam A and B only
`=(2)/(3)xx3x=2x`

Now, `2x+3x+3x+80=720`
`rArr x=80`
and, ` 12.5x +a+(a)/(2)=2000`
`(5a)/(a)=1000`
`rArr a=400`
Student not appeared I N exam `B=200-720=1280`


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