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Explanation:

Let the cost of each pen and fan be p and f respectively.

⇒ 8p + 14f = 500
⇒ 4p + 7f = 250   ...(1)

We need to find 12p + 21f

Multiplying (1) with 3 we get,
⇒ 12p + 21f = 750   .

Hence, option (c).


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