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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? |
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Answer» A. 100/7% 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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