def CalculateThePrice(TheUnitPrice, num, freight):
    """
    计算价格
    :param TheUnitPrice: 单价
    :param num: 数量
    :param freight:运费
    :return: 总价
    """
    # 单价*数量+邮费
    price = TheUnitPrice * num + freight
    # 保留两位小数
    return '%.2f' % price