total_cost of the order is not saved to the database. Please fix it.

Please help in getting the total_cost of the order to the database.

[henrymbuguak]

@MiruDox Have a look at this file of how we save customer order in the database:
https://github.com/muvatech/Shopping-Cart-Using-Django-2.0-and-Python-3.6/blob/master/orders/views.py