In an examination, B obtained 20% more marks than those obtained by A and A obtained 10% less marks than those obtained by C. D obtained 20% more marks than those obtained by C. By what percentage are the marks obtained by D more than those obtained by A?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 33%
In an examination, B obtained 20% more marks than those obtained by A.
Let the marks obtained by A = 90x.
Marks obtained by B = 90x × 120% = 108x.
A obtained 10% less marks than those obtained by C.
Marks obtained by C = 90x × 100/90 = 100x.
D obtained 20% more marks than those obatined by C,
Marks obtained by D = 100x × 120% = 120x.
Required% = (120x - 90x)/9x × 100 = 33.33%.