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What is the ratio of the price of a pencil to that of a ball pen if pencils cost Rs 16 per score and ball pens cost Rs 8.40 per dozen?

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4:5

1:20

4:24

8:7

answer is D.

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Detailed Solution

Given that,
Cost of pencil = Rs 16
Cost of ball pen = Rs 8.40
One score

= 20

pencils.
Cost of pencil,

⇒ 1620

⇒ R s .0.80

.
Cost of one dozen of ball pen =8.40
Cost of pen,

⇒ 8.40 12

⇒ R s .0.70

The ratio of price of pencil to the ratio of ball pen,

⇒ 0.80 0.70

⇒ 87

Thus., the ratio of the price of pencil to that of ball pen, if pencils cost Rs 16 per score and ball pens cost Rs 8.40 per dozen will be

8 : 7

.
Therefore, option 4 is correct.

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