function tradeCommission (input) {
    let city = input.shift();
    let sells = +input.shift();
    let  commission = 0;

    switch (city){
        case "Sofia" :
        if (sells >= 0 && sells <= 500) {
             commission = sells * 0.05
        } else if (sells > 500 && sells <= 1000) {
             commission = sells * 0.07
        } else if (sells > 1000 && sells <= 10000) {
             commission = sells * 0.08
        } else if (sells > 10000) {
             commission = sells * 0.12
        } break;

        case "Varna" :
        if (sells >= 0 && sells <= 500) {
             commission = sells * 0.045
        } else if (sells > 500 && sells <= 1000) {
             commission = sells * 0.075
        } else if (sells > 1000 && sells <= 10000) {
             commission = sells * 0.1
        } else if (sells > 10000) {
             commission = sells * 0.13
        } break;

        case "Plovdiv" :
        if (sells >= 0 && sells <= 500) {
             commission = sells * 0.055
        } else if (sells > 500 && sells <= 1000) {
             commission = sells * 0.08
        } else if (sells > 1000 && sells <= 10000) {
             commission = sells * 0.12
        } else if (sells > 10000) {
             commission = sells * 0.145
        } break;
    }

    console.log (commission.toFixed(2))
}

tradeCommission ([`Sofia,`, 1500])