;-)

function solve(input) {
    let fruit = input[0];
    let day = input[1];
    let quentity = Number(input[2]);
    let price = 0

    if (day === "Monday"
        || day === "Tuesday"
        || day === "Wednesday"
        || day === "Thursday"
        || day === "Friday")
        switch (fruit) {
            case "banana": price = quentity * 2.50; break;
            case "apple": price = quentity * 1.20; break; // aplle => apple !!
            case "orange": price = quentity * 0.85; break;
            case "grapefruit": price = quentity * 1.45; break;
            case "kiwi": price = quentity * 2.70; break;
            case "pineapple": price = quentity * 5.50; break;
            case "grapes": price = quentity * 3.85; break;
            default: console.log('error'); break;
        } else if (day === "Sunday" || day === "Saturday") { // Saturday !!
            if (fruit == "banana") {
                price = quentity * 2.70;
            }
            else if (fruit == "apple") {
                price = quentity * 1.25;
            }
            else if (fruit === "orange") {
                price = quentity * 0.90;
            }
            else if (fruit == "grapefruit") {
                price = quentity * 1.60;
            }
            else if (fruit == "kiwi") {
                price = quentity * 3.00;
            }
            else if (fruit == "pineapple") {
                price = quentity * 5.60;
            }
            else if (fruit == "grapes") {
                price = quentity * 4.20;
            } else {
                console.log(`error`);
            }
        }
    else {
        console.log(`error`);
    }
    console.log(price);
}