Question

If the cost price of 10 pens is equal to the selling price of 8 pens, find the gain or loss per cent.​

Answer 1

Answer:

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Step-by-step explanation:

Let the cost price of each card be $ x

Then, CP of 8 pens = $ 8x.

SP of 8 pens = CP of 10 pens = $ 10x.

Thus, CP = $ 8x and SP = $ 10x.

Since, (SP) > (CP), there is a gain.

Gain = $ (10x - 8x) = $ 2x.

Gain % = [(gain / CP) × 100] %

= [(2x / 8x) × 100] %

= 25%

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Answer 2

Let the cost price of each card be $ x

Then, CP of 8 pens = $ 8x.

SP of 8 pens = CP of 10 pens = $ 10x.

Thus, CP = $ 8x and SP = $ 10x.

Since, (SP) > (CP), there is a gain.

Gain = $ (10x - 8x) = $ 2x.

Gain % = [(gain / CP) × 100] %

= [(2x / 8x) × 100] %

= 25%

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