```\\nfunction changeFees(uint256 newBuyMul, uint256 newSellMul)\\n    external\\n    onlyOwner\\n{\\n    require(\\n        newBuyMul >= 90 &&\\n            newSellMul >= 90 &&\\n            newBuyMul <= 100 &&\\n            newSellMul <= 100,\\n        "Fees are too high"\\n    );\\n\\n    buyMul = newBuyMul;\\n    sellMul = newSellMul;\\n\\n    emit FeesMulChanged(newBuyMul, newSellMul);\\n}\\n```\\n