Comissions

function comissions(input) {
    let town = String(input[0]);
    let sales = Number(input[1]);
    let totalSum = 0;
    if (town == "Sofia") {
        if (0 <= sales && sales <= 500) {
            totalSum = sales * 0.05;
        } else if (500 < sales && sales <= 1000){
            totalSum = sales * 0.07;
        } else if (1000 < sales && sales <= 10000) {
            totalSum = sales * 0.08;
        } else if (sales > 10000) {
            totalSum = sales * 0.12;
        } else {
            totalSum = "error";
        }
    } else if (town == "Varna"){
        if (0 <= sales && sales <= 500) {
            totalSum = sales * 0.045;
        } else if (500 < sales && sales <= 1000){
            totalSum = sales * 0.075;
        } else if (1000 < sales && sales <= 10000) {
            totalSum = sales * 0.1;
        } else if (sales > 10000) {
            totalSum = sales * 0.13;
        } else {
            totalSum = "error";
        }
    } else if (town == "Plovdiv") {
        if (0 <= sales && sales <= 500) {
            totalSum = sales * 0.055;
        } else if (500 < sales && sales <= 1000){
            totalSum = sales * 0.08;
        } else if (1000 < sales && sales <= 10000) {
            totalSum = sales * 0.12;
        } else if (sales > 10000) {
            totalSum = sales * 0.145;
        } else {
            totalSum = "error";
        }
    } else {
        totalSum = "error";
    }
    if (totalSum == "error") {
        console.log(totalSum);
    } else {
        console.log(totalSum.toFixed(2));
    }
}