Solution

function solve(input) {
    let drinkName = String(input.shift());
    let sugarQntt = String(input.shift());
    let drinkNum = Number(input.shift());
    let totalPrice = 0;

    switch (drinkName) {
        case 'Espresso':
            switch (sugarQntt) {
                case 'Without':
                    totalPrice = drinkNum * 0.90;
                    break;

                    case 'Normal':
                        totalPrice = drinkNum * 1;
                        break;

                        case 'Extra':
                            totalPrice = drinkNum * 1.20;
                            break;

            }

            if (drinkNum > 5) {
                totalPrice *= 0.75;
            }

            break;

            case 'Cappuccino':
                switch (sugarQntt) {
                    case 'Without':
                        totalPrice = drinkNum * 1;
                        break;

                        case 'Normal':
                            totalPrice = drinkNum * 1.20;
                            break;

                            case 'Extra':
                                totalPrice = drinkNum * 1.60;
                                break;
                }

                break;

                case 'Tea':
                    switch (sugarQntt) {
                        case 'Without':
                            totalPrice = drinkNum * 0.50;
                            break;

                            case 'Normal':
                                totalPrice = drinkNum * 0.60;
                                break;

                                case 'Extra':
                                    totalPrice = drinkNum * 0.70;
                                    break;
                    }

                    break;

    }

    if (sugarQntt === 'Without') {
        totalPrice *= 0.65;
    }

    if (totalPrice > 15) {
        totalPrice *= 0.80;
    }

    console.log(`You bought ${drinkNum} cups of ${drinkName} for ${totalPrice.toFixed(2)} lv.`);
}