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#### Question

The selling price of 12 pens is equal to the cost price of 15 pens . find the gain percent.

**Posted by:** rishu priyadarshi **in** Olympiad{RMO+INMO+IMO} 8 years ago, Total Answer(s): 5

#### Answer(s)

Let the CP of each pen be Rs.x.

Then,

CP of 12 pens=Rs.12

SP of 12 pens=CP of 15 pnes=Rs.15

now,gain=SP-CP=Rs.(15-12)=Rs.3

gain%=gain/cp*100

=(3/12*100)%=25%

Hence,the gain=25%.

By: arishta jain, 8 years ago

Let the C.P of 1 pen be Rs.1

Therefore,

The C.P of 15 pens = Rs. 15

Given,

C.P of 15 pens= S.P of 12 pens.

So, S.P of 12 pens = Rs.15

Selling Price of 1 pen = Rs. 1.25

Gain= Rs. 0.25

Gain percent= Gain x 100/C.P %

= 0.25 x 100/1 %

=25/1 %

= 25 %

Therefore, the gain percent is 25%

Hope You understood it... :-)

By: Sriram Vudayagiri, 8 years ago

12SP=15CP

SP/CP= 15/12

15-12=3

3/12*100=25%

By: RAHUL KUMAR, 1 year ago

12SP=15CP

SP/CP= 15/12

15-12=3

3/12*100=25%

By: RAHUL KUMAR, 1 year ago

SP OF 12 PENS =CP OF 15 PENS

SP OF 1 PENS = R. 1

SP OF 12 PENS= R. 12

SP OF 15 PENS = R. 15

CP OF 15 PENS =R. 12

NOW, SP >CP

SO, GAIN = SP -CP

=R. 15 - R. 12 =R. 3

GAIN % = GAIN *100. =3/12 *100 =25%

CP

Answer=25%

By: RAHUL KUMAR, 1 year ago

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