How does the Multi Swimmer Discount calculate in the Online Registration module for dollar amounts?

The system will multiply the number of swimmers by the original cost per child and discount the amount in the corresponding discount line. It does NOT add up the discount amounts as the number of swimmers registered increases. For example, if you set it up like so:

Registration per swimmer = $100

Multi Swimmer Discount:
2 children = $50
3 children = $75
4 children = $100

The math would look like this for a family of 2 swimmers:
(2 * 100) - 50 = $150 total

And for 4 swimmers:
(4 * 100) - 100 = $300 total

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See Also 

Video Tutorials
Registration Overview Video Tutorial
Online Registration - Best Practice
How do I add a multi-swimmer discount to the registration system?