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let transactionType: string = "Transfer"; // You can change the operation type
let commission: number;

switch (transactionType) {
    case ___:
        ___ = 0.5;
        break;
    case ___:
        ___ = ___;
        break;
    case ___:
        ___ = ___;
        break;
    case ___:
        ___ = ___;
        break;
    ___:
        ___ = -1; // Handle unknown transaction types
}

console.log(`Commission for ${transactionType}: ${commission}%`);