Question

the cost price of 21 pen is equal to the selling price of 20 pens.the loss or gain percentage is​

Answer 1

C.p. of 21 pens = 20x

S.p. of 20 pens = 21x

Since s.p. > c.p., so there is a profit

profit = s.p. - c.p.

" = 21x - 20x

" = 1x

p% =p/c.p.^ × 100

p% =1x/20x^ × 100

p% = 5% ( Ans)

Answer 2

The Gain% is 5%

Step-by-step explanation:

Let CP of 1 pen be Re.1

Cost price of 21 pens = Rs.21

Cost price of 20 pens = Rs.20

The cost price of 21 pen is equal to the selling price of 20 pens

SP of 20 pens = Cp of 21 pens = Rs.21

SP of 20 pens > Cp of 20 pens

So, Profit

Profit % = $\frac{SP-CP}{CP} \times 100 = \frac{21-20}{20} \times 100=5\%$

Hence The Gain% is 5%

#Learn more:

On selling 100 pens a man gains the selling price of 20 pens.The gain per cent is?​

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