Question

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The selling price of 18 pencils✏️ is the same as cost price of 21 pencils✏️. Find the gain percent.​

Answer 1

Correct option is

A

14.2%

Let SP of each pencils be Rs.x

SP of 18 pencils be Rs.18x

Let CP of each pencils be Rs.y

CP of 21 pencils be Rs.21y

According to the question,

18x=21y

y

x

=

18

21

Gain%=

CP×100

SP−CP

⟹

18

21−18

×100=14.2%

Hence, gain%=14.2%.

Answer 2

Answer:

Let SP of each pencils be Rs.x

SP of 18 pencils be Rs.18x

Let CP of each pencils be Rs.y

CP of 21 pencils be Rs.21y

According to the question,

18x=21y

y = 18

x= 21

Gain%=

CP×100/SP–CP

21–18/18×100

= 14.2%

Hence, gain%=14.2%.