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I want to introduce transaction fees. I would like to take 0.5% of the msg.value. So whenever a user calls this function I want to assign a variable the 0.5% of the msg.value

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Just divide by 200.

uint256 fee = msg.value / 200;

And there is no floating point in solidity, so you get uint256 as a result, and the division result rounds towards zero.

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