09. Trade Commissions 2 - Conditional Statements Advanced

function tradeCommissions(input) {
    let city = (input.shift()).toLowerCase();
    let sales = Number(input.shift());

    let commissions = -1;

    if( city == "sofia") {
        if (sales >= 0 && sales <= 500) {
            commissions = sales * 0.05;
        } else if (sales >= 500 && sales <= 1000) {
            commissions = sales * 0.07;
        } else if (sales >= 1000 && sales <= 10000) {
            commissions = sales * 0.08;
        } else if (sales >= 10000) {
            commissions = sales * 0.12;
        }

    }else if( city == "varna") {
        if (sales >= 0 && sales <= 500) {
            commissions = sales * 0.045;
        } else if (sales >= 500 && sales <= 1000) {
            commissions = sales * 0.075;
        } else if (sales >= 1000 && sales <= 10000) {
            commissions = sales * 0.1;
        } else if (sales >= 10000) {
            commissions = sales * 0.13;
        }

    }else if( city == "plovdiv") {
        if (sales >= 0 && sales <= 500) {
            commissions = sales * 0.055;
        } else if (sales >= 500 && sales <= 1000) {
            commissions = sales * 0.08;
        } else if (sales >= 1000 && sales <= 10000) {
            commissions = sales * 0.12;
        } else if (sales >= 10000) {
            commissions = sales * 0.145;
        }

    }

    if (commissions >= 0) {
      console.log(commissions.toFixed(2));
    } else {
      console.log("error");
    }

}