phoneBill

// Use const instead of let for variables that don't change
const input = [
    `31`,
    '115'
];

// Use descriptive names for variables and functions
const printOutput = this.print || console.log;
const getInput = this.gets || ((arr, index) => () => arr[index++])(input, 0);

// Use camelCase for variable names
let messages = Number(getInput());
let minutes = Number(getInput());
let additional = 0;
let taxes;

// Use constants for fixed values
const FREE_MESSAGES = 20;
const FREE_MINUTES = 60;
const MESSAGE_FEE = 0.06;
const MINUTE_FEE = 0.10;
const TAX_RATE = 0.2;
const BASE_FEE = 12;

// Use a function to calculate the additional fee and print the message
function calculateAdditionalFee(used, free, fee, unit) {
    let extra = used - free;
    if (extra > 0) {
        let charge = extra * fee;
        additional += charge;
        printOutput(`${extra} additional ${unit} for ${charge.toFixed(2)} levas`);
    } else {
        printOutput(`0 additional ${unit} for 0.00 levas`);
    }
}

// Call the function for messages and minutes
calculateAdditionalFee(messages, FREE_MESSAGES, MESSAGE_FEE, 'messages');
calculateAdditionalFee(minutes, FREE_MINUTES, MINUTE_FEE, 'minutes');

// Calculate and print the taxes and final bill
if (additional > 0) {
    taxes = additional * TAX_RATE;
    printOutput(`${taxes.toFixed(2)} additional taxes`);
} else {
    printOutput('0.00 additional taxes');
}
let final = BASE_FEE + additional + taxes;
printOutput(`${final.toFixed(2)} total bill`);