Question

In an examination, the score of A was 10% less than that of B, the score of B was 25% more than that of C, and the score of C was 20% less than that of D. If A scored 72, then the score of D was

• A. 80
• B. 70
• C. 90
• D. 60

Answer 1

Answer: (A)

80

Answer 2

Given $A= 72$
Also, $A=0.9×B$
$⇒ B=\frac{A}{0.9}$
$=\frac{72}{0.9}$
$=80.$

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And $B=1.25×C$
$⇒ C = \frac{B}{1.25}$
$=\frac{80}{1.25}$
$=64$

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And $C=0.8×D$
$⇒ D =\frac{C}{0.8}$
$=\frac{ 64}{0.8}$
$=80.$