Question

1) A grocer sold 5 kg of wheat flour at Rs 30 per kg and gained 20%. If he had sold

it at Rs 27 per kg, what would be his gain or loss percent?

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Answer 1

given,

selling price (sp)=rs 5 ×30

=rs 150

now, gain %=20%

cost price (cp)=

`(sp * 100)/(100 + gain\%)`

`= (150 * 100)/(100 + 20)`

therefore cp= rs125

now,

again in 2nd case

sp= rs 27×5

therefore sp=rs 135

and cp= rs125

now, sp>cp so,

`gain\% = (sp - cp)/(cp) * 100\%`

or, gain=

`= (135 - 125)/(125) * 100\%`

therefore gain %= 8%.... is answer

hope it helps..