Multiple If's problem

I need to figure our how to write the correct IF formula for a cell that has multiple arguments/factors involved. I'll do my best to explain the arguments step by step below. Keep in mind this is only one portion of the whole commissions structure, so a rep would never actually owe the company money for discounting these packages. I have attached the spreadsheet that I've started. Essentially, I'd like to figure out how to combine the results in columns "P" & "Q" on worksheet "Sales" into one column.

Package A: $99.00
If you collect from the customer the full $99 you get a $15 commission

If you collection more than the $99, you get the $15 + anything above and beyond the $99.

If you collect less than the $99, you owe the difference. Example:you only collect $49, you owe the difference of $50 back to the company.

If the customers credit score is 725 + and you discount the $99, you are only 50% of the difference. Example: You only collect $49 and the customer has a credit score of 725+, you would only owe the difference of $25.

Thank you in advance with any assistance you can offer!

Select Blank Sales Spreadsheet.xlsx

Column G is just the base price of the package. The actual amount that the rep may actually charge is reflected in column K.

If you open up the attached spreadsheet, and enter in $99 in K2, you'll see that it will show the $15 commission in column "O". If you enter say $109 in K2, you'll see the the commission amount column "O" increase to $25 and the deduction amounts in columns "P" & "Q". go away because the rep entered $99 or more in column K2. My goal would be to condense columns "P" & "Q" formulas together into one formula. Hope this is making sense.

FDibbins, your awesome!!!! Thank you for that. It seems to be reading correctly. Thank you so very much!