Computer Store JS Fundamentals

function computerStore(arr) {
    let customerType = arr.pop();
    let prices = arr.map(x => Number(x));

    let priceWithoutTaxes = 0;
    let taxes = 0;
    let totalItemPrice = 0;
    let totalTaxes = 0;
    let totalPrice = 0;
    for (let i = 0; i < prices.length; i++) {
        let price = prices[i];

        if (price < 0) {
            console.log("Invalid price!");
            continue;
        }

        itemTaxes = price * 0.2;
        totalItemPrice = price + itemTaxes;
        totalTaxes += itemTaxes;
        priceWithoutTaxes += price;
        totalPrice += totalItemPrice;
    }

    if (customerType === "special") {
        totalPrice -= totalPrice * 0.1;
    }

    if (totalPrice === 0) {
        console.log("Invalid order!");
    } else {
        console.log("Congratulations you've just bought a new computer!");
        console.log(`Price without taxes: ${priceWithoutTaxes.toFixed(2)}$`)
        console.log(`Taxes: ${totalTaxes.toFixed(2)}$`);
        console.log(`-----------`);
        console.log(`Total price: ${totalPrice.toFixed(2)}$`);
    }
}