catFood.js

function catFood(input) {
    let index = 0;
    let catNumber = Number(input[index]);
    index++;
    let group1 = 0;
    let group2 = 0;
    let group3 = 0;
    let catFoodTotal = 0;
    let pricePerKg = 12.45;

    for (i = 0; i < catNumber; i++) {
        let catFood = Number(input[index]);
        index++;
        catFoodTotal += catFood / 1000;

        if (catFood >= 100 && catFood < 200) {
            group1++;
        } else if (catFood >= 200 && catFood < 300) {
            group2++;
        } else if (catFood >= 300 && catFood < 400) {
            group3++;
        }
    }

    let priceTotal = catFoodTotal * pricePerKg;
    console.log(`Group 1: ${group1} cats.`);
    console.log(`Group 2: ${group2} cats.`);
    console.log(`Group 3: ${group3} cats.`);
    console.log(`Price for food per day: ${priceTotal.toFixed(2)} lv.`);
}

catFood(["6", "102", "236", "123", "399", "342", "222"]);
catFood(["10", "256", "348", "198", "322", "186", "294", "321", "100", "200", "300"]);
catFood(["7", "100", "200", "342", "300", "234", "123", "212"]);