How will you make Tables in PowerPoint work like Excel? [Reader Question]

We copy tables from excel sheet onto PowerPoint. But once we have done that, the tables do not work like they do in Excel. The formulas don't work. Here is a table.

The challenge is, how will you copy this table onto PowerPoint and still have the formulas intact. So after copying, if we change the discount from 5% to 6% in PowerPoint, the Total (after Discount) column will change. How will you do this? Avoid Googling for the answer :-)