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If 52 packets of 12 pencils each cost Rs. 499.20. What is the cost of 65 packets of 10 pencils each?

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answer is A.

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Detailed Solution

Given,
52 packets of 12 pencils each cost Rs. 499.20.
Total number of pencils,

⇒ 12 × 52 ⇒ 624

So, 624 pencils cost Rs. 499.20.
Now,

1

pencil costs,

⇒ 499.20 624 = R s . 0.80

Multiplying the cost of 65 pencils and the cost of 1 pencil,
Here, 65 packets have 10 pencils each.
So,

⇒ 65 × 10 ⇒ 650

Here, 65 packets have 650 pencils.
Now, if 1 pencil costs Rs. 0.80, then, 650 pencil costs

⇒ 0.80 × 650 ⇒ R s . 520

Thus, the cost of 65 packets of 10 pencils each will be Rs. 520.
Therefore, option 1 is correct.

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