def round_ans(val):
    """
    Rounds numbers to 2 decimal places.
    :param val: Number to be rounded
    :return: String of number rounded to 2 decimal places
    """
    return "{:.2f}".format(val)


def cm_to_inches(val):
    """
    Converts centimeters to inches.
    :param val: Value in cm
    :return: Converted value in inches (string)
    """
    return round_ans(val / 2.54)


def m_to_feet(val):
    """
    Converts meters to feet.
    :param val: Value in meters
    :return: Converted value in feet (string)
    """
    return round_ans(val * 3.28084)


def km_to_miles(val):
    """
    Converts kilometers to miles.
    :param val: Value in km
    :return: Converted value in miles (string)
    """
    return round_ans(val * 0.621371)