In answer to the requirement for information on the “discount” for e-book v. print, I gave them the following information:
These e-books are not available in print form. The complete book, which includes all content from the above 9 e-books, retails at average price 91 Euros mail order (THB 3,852) in Europe, Australia, N. America and Asia (except Thailand). Prices have been set so that the complete set of 8 e-books (+ free app) can be purchased for 20% less than the average price of the complete print book in the above markets.
I have attached the original spreadsheet with all this information.
Please ask K Muk to sort this out.