1.

The marked price of an article is increased by 25% and the selling price is increased by 16.66%, then the amount of profit doubles. If the original marked price be Rs. 400 which is greater than the corresponding cost price by 33.33%, what is the increased selling price?

Answer»

A. 480
B. 420
C. 1000
D. 1360

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`
Students appeared in examA or in exam C
`=360+120+80+160+400+200=1360`


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