Question

the selling price of 10 pens is equal to the cost price of 12 pens find the gain percent or loss present

Answer 1

Hey,sup!

As per the question,

Let the cost price of pen be x.
So cost price of 10 pen = 10x.
Selling price of 10 pen = cost price of 12 pen.
So selling price of 10 pen = 12x.
Gain= 12x-10x =2x.

Gain %= Gain/CP ×100.
= 2x/10x * 100.
= 1/5 ×100.
= 20%.

Hope it helps.

Answer 2

hey here,

$sp \: of \: 1pen \: = rs \: 1 \\ sp \: of \: 12pen \: = \: rs12 \\ \\ cp \: of \: 1pen \: \: = rs1 \\ cp \: of \: 10pen \: = rs10$
$gain \: = sp \: - cp$
gain = 12 - 10

gain = 2

$gain\% \: = gain \: \times \: 100 \div cp$
gain% = 2 * 100/ 10

gain% = 20℅

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