Discounts
==========

#. A shop offers a discount of 5€ if the total amount of the purchase,
   including VAT, is more than 50€. Write the function
   :py:func:`discount1` that given the amount of the purchase (without
   VAT) and the VAT percentage to be applied (``float``), returns the
   total amount to pay (``float``). Save this function into a file
   named :file:`discount1.py`. Examples:
   
   .. literalinclude:: discount1.txt
       :language: python3
       :lines: 2-

   .. note::

      More tests are provided in the :download:`discount1.txt <discount1.txt>`

#. A shop offers a discount of 5€ if the total amount of the purchase,
   including VAT, is more than 100€ and a discount of 2€ if the
   purchase is lower or equal to 100€. Write the function
   :py:func:`discount2` that given the amount of money of the purchase
   (without VAT) and the VAT to be applied (``float``), returns the
   total amount to pay (``float``). Suppose that the purchase is
   always higher than 2€. Save this function into a file named
   :file:`discount2.py`. Examples:
   
   .. literalinclude:: discount2.txt
      :language: python3
      :lines: 2-

   .. note::

      More tests are provided in the :download:`discount2.txt <discount2.txt>`

#. A shop offers a discount of 5€ if the total amount of the purchase,
   including VAT, is more than 100€, a discount of 10€ if the purchase
   is higher than 150€ and a discount of 20€ if the purchase is higher
   than 250€. Only one discount can be applied. Write the function
   :py:func:`discount3` that given the amount of money of the purchase
   (without VAT) and the VAT to be applied (``float``), returns the
   total amount to pay (``float``). Save this function into a file
   named :file:`discount3.py`. Examples:

   
   .. literalinclude:: discount3.txt
      :language: python3
      :lines: 2-

   .. note::

      More tests are provided in the :download:`discount3.txt <discount3.txt>`

#. A shop offers a discount of 5€ if the total amount of the purchase,
   including VAT, is more than 100€. Moreover, if the client buys more
   than 5 units of the product, it offers an additional discount of
   3€. Write the function :py:func:`discount4` that given the amount
   of money of the purchase (without VAT), the VAT to be applied
   (``float``) and the number of units bought (``int``), returns the
   total amount to pay (``float``).Save this function into a file
   named :file:`discount4.py`. Examples:

   
   .. literalinclude:: discount4.txt
      :language: python3
      :lines: 2-

   .. note::

      More tests are provided in the :download:`discount4.txt <discount4.txt>`

.. rubric:: Solutions

A solution of these functions is provided in the :download:`discount1.py 
<solutions/discount1.py>`, :download:`discount2.py
<solutions/discount2.py>`, :download:`discount3.py
<solutions/discount3.py>`, :download:`discount4.py
<solutions/discount4.py>`