Buying an item for a certain price and selling it for double the price

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Check below answers in case you are looking for other related questions:
Does Islam permit bidding in auctions?
Can he rent the traditional set of jewellery and then return it to the jeweller in order to get married?

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Related Answers:
His friends ask him to buy computers for them and he adds a profit for himself
There is nothing wrong with selling equipment that measures the levels of alcohol in the body
The car will not be put in his name until he pays the last installment
Does Islam permit bidding in auctions?
Can he rent the traditional set of jewellery and then return it to the jeweller in order to get married?

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