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At an examination in which maximum marks are 500. A got 10% less than B, B got 25% more than C and C got 20% less than D. If A got 360 marks what percentage of marks was obtained by D?

80%
90%
68%
72%
Explanation:
Let marks obtained by D = x C’s marks = 0.80x B’s marks = 1.25 (0.80x) A’s marks = (0.90) (1.25) (0.80x) = 0.9x But 0.9x = 360 ⇒ x = 400 Percentage of Marks obtained by D = 400 x 100/500 = 80%.
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