Christmas Preparation

function christmasPreparation(input) {
   let rollPrice = Number(input[0]) * 5.8;
   let clothPrice = Number(input[1]) * 7.2;
   let gluePrice = Number(input[2]) * 1.2;
   let percentDiscount = Number(input[3]);
   let sum = rollPrice + clothPrice + gluePrice;
   console.log((sum - (sum / 100 * percentDiscount)).toFixed(3));
}