How are Tips or Tax calculated with Cash Discounting?

How are Tips or Tax calculated with Cash Discounting?

Info
It is essential to consider the Display Price as the price of the Service, Product, Package, Membership and Package.  

Tips will be calculated on the Display Price.

Example: 
Service Set Price $100.00 
Service Display Price $103.75
10% Tip would be $10.38

Tax will be calculated on the Display price when paid with a Non Cash Payment Type and on the Set Price when paid with Cash.

Example:
Product Set Price $100.00 
Product Display Price $103.75
10% Product Tax $10.38 (Non Cash Payment
10% Product Tax $10.00 (Cash Payment)