Introduction
As an author you receive 80% of
the net profits generated from sale. The new profit is calculated with a simple
formula
Net Profit = MRP of Book -
(Distribution Cost + Printing Cost)

MRP is based on details
mentioned by you while updating your Metadata
Distribution Cost is 45% off the
MRP
Printing Cost is determined
based on Trim Size, pages and Format of your book
For e.g
Book MRP - US$ 39.00
Printing Cost - US$ 6
Then
Net Profits = $39 - (45% + $6)
Net Profits = $39 - ($17.55 + $6)
Net Profits = $15.45
Authors Share = $12.36

This is just an example and not to be taken as a real calculation. Actual calculation will be provided on the Author's Dashboard while uploading your files.