How would I implement a buy/sell transfer tax within solidity - solidity

Question

I want to put a transfer tax into my code but not sure how to go about it. I would apply a 2.5% tax on buys and sells. Any help/advice would be greatly appreciated. This is what I have so far:
pragma solidity ^0.8.4;
contract Token {
mapping(address => uint) public balances;
mapping(address => mapping(address => uint)) public allowance;
uint public totalSupply = 100000000000 * 10 ** 18;
string public name = "*****";
string public symbol = "****";
uint public decimals = 18;
event Transfer(address indexed from, address indexed to, uint value);
event Approval(address indexed owner, address indexed spender, uint value);
constructor(){
balances[msg.sender] = totalSupply;
}
function balanceOf(address owner) public view returns(uint){
return balances[owner];
}
function transfer(address to, uint value) public return(bool){
require(balanceOf(msg.sender) >= value, 'balance too low');
balances[to] += value;
balances[msg.sender] -= value;
emit Transfer(msg.sender, to, value);
return true;
}
function transferFrom(address from, address to, uint value) public returns(true){
require(balanceOf(from) >= value, 'balance too low');
require(allowance[from][msg.sender] >= value, 'allowance too low');
balances[to] +=value;
balances[from] -= value;
emit Transfer (from, to, value);
return true
}
function approve (address spender, uint value) public reutrns(bool) {
allowance[msg.sender][spender] = value;
emit Approval(msg.sender, spender, value);
return true;
}
}