comissions

function comissions(input) {
    let city = input.shift();
    let sales = Number(input.shift());
    let comission = -1;
    if (city == "Sofia") {
        if (sales >= 0 && sales <= 500) {
            comission = sales * 0.05;
        } else if (sales > 500 && sales <= 1000) {
            comission = sales * 0.07;
        } else if (sales > 1000 && sales <= 10000) {
            comission = sales * 0.08;
        } else if (sales > 10000) {
            comission = sales * 0.12;
        }
    } else if (city == "Varna") {
        if (sales >= 0 && sales <= 500) {
            comission = sales * 0.045;
        } else if (sales > 500 && sales <= 1000) {
            comission = sales * 0.075;
        } else if (sales > 1000 && sales <= 10000) {
            comission = sales * 0.1;
        } else if (sales > 10000) {
            comission = sales * 0.13;
        }
    } else if (city == "Plovdiv") {
        if (sales >= 0 && sales <= 500) {
            comission = sales * 0.055;
        } else if (sales > 500 && sales <= 1000) {
            comission = sales * 0.08;
        } else if (sales > 1000 && sales <= 10000) {
            comission = sales * 0.12;
        } else if (sales > 10000) {
            comission = sales * 0.145;
        } else {
            console.log("error")
        }
    } else {
        console.log("error");
    }
    if (comission > 0) {
        console.log(`${comission.toFixed(2)}`);
    }
}

comissions(["Plovdiv", -20]);