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A man bought 500 metres of electronic wi...

A man bought 500 metres of electronic wire at 50 paise per metre. He sold `50%` of it at a profit of `5%`. At what percent should he sell the remainder so as to gain `10%` on the whole transaction?

A

`13%`

B

`12.5%`

C

`15%`

D

`20%`

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