'Solidity Syntax error with changing mint rate uint

I am new to solidity, and am wondering why this isn't working.

//Mint Price
uint256 public mintRate = 0.025 ether;

function changeMintRate(uint256 _mintRate) public onlyOwner{
        uint256 public mintRate = _mintRate ether;
    }

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'Solidity Syntax error with changing mint rate uint

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