06. Bills

function bills(input) {
    let months = Number(input[0]);
    let electricity = 0;
    let water = months * 20;
    let internet = months * 15;

    for (let i = 1; i <= months; i++) {
        electricity += Number(input[i]);
    }

    let other = (electricity + 35 * months) * 1.2;
    let average = (electricity + water + internet + other) / months;

    console.log(`Electricity: ${electricity.toFixed(2)} lv`);
    console.log(`Water: ${water.toFixed(2)} lv`);
    console.log(`Internet: ${internet.toFixed(2)} lv`);
    console.log(`Other: ${other.toFixed(2)} lv`);
    console.log(`Average: ${average.toFixed(2)} lv`);
}

РЕШЕНИЕ СЪС SHIFT() И WHILE:

function bills(input) {
    let months = Number(input.shift());
    let electricity = 0;
    let water = months * 20;
    let internet = months * 15;

    while (input.length !== 0) {
        electricity += Number(input.shift());
    }

    let other = (electricity + 35 * months) * 1.2;
    let average = (electricity + water + internet + other) / months;

    console.log(`Electricity: ${electricity.toFixed(2)} lv`);
    console.log(`Water: ${water.toFixed(2)} lv`);
    console.log(`Internet: ${internet.toFixed(2)} lv`);
    console.log(`Other: ${other.toFixed(2)} lv`);
    console.log(`Average: ${average.toFixed(2)} lv`);
}

РЕШЕНИЕ С МЕТОДИ:

function bills(input) {
    let months = Number(input.shift());
    let electricity = input.map(Number).reduce((a, b) => a + b, 0);
    let water = months * 20;
    let internet = months * 15;
    let other = (electricity + 35 * months) * 1.2;
    let average = (electricity + water + internet + other) / months;

    console.log(`Electricity: ${electricity.toFixed(2)} lv`);
    console.log(`Water: ${water.toFixed(2)} lv`);
    console.log(`Internet: ${internet.toFixed(2)} lv`);
    console.log(`Other: ${other.toFixed(2)} lv`);
    console.log(`Average: ${average.toFixed(2)} lv`);
}