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If the cost of 12 pens is ₹ 138, then what is the cost of 14 such pens?

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₹161

₹160

₹180

₹140

answer is A.

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Detailed Solution

Given, the cost of 12 pens is ₹ 138.
By using the unitary method,

Cost of 1 pen = cost of all pen number of pens

Cost of one pen =

\frac{138}{12}

= 11.5.
Also,
Cost of the 14 pens = Cost of 1 pen

\times

14.
So the cost of 14 pens is,
11.5

\times 14

= ₹ 161
Hence, option 1 is correct.

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