PercentFix Discount Chrismas

function chrismas(input) {

    let broiHartiq = Number(input[0]);
    let broiPlat = Number(input[1]);
    let broiLepilo = Number(input[2]);
    let percent = Number(input[3]);

    let hartiq = 5.80 * broiHartiq;
    let plat = 7.20 * broiPlat;
    let lepilo = 1.20 * broiLepilo;

    let total = hartiq + plat + lepilo;

    let percentFix = (100 - percent) / 100; // percent отстъпка от цената

     console.log((total * percentFix).toFixed(3));

}

chrismas(["4",
"2",
"5",
"13"])