Question

If the cost price of 15 pens is equal to the selling price of 20 pens, find the gain or loss percent

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Answer 1

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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%

Answer 2

If the cost price of 15 pens is equal to the selling price of 20 pens,

Let the cost price of each one be ₹x and the selling price of each pen is y.

Cost price of 15 pen = 15 × x = 15x

Selling price of 20 pen = 20 × y = 20y

As per statement :

15x = 20y

y = 15x/20

y = 3/4×

y = 0.75x

Loss percentage = (Cost price - sale price)/Cost price ×100

Loss % = (x - 0.75x)/x ×100

Loss % = 0.25x/x × 100

Loss % = 0.25 × 100

Loss % = 25%

Answer the percentage loss is 25 percent
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