Simplifying cost calculation using array instead of IF statement

Hello,

I am in the process of calculating the cost of refining precious metals based on user input of specific parameters. For example, if a certain dore intake of Silver has 90% Silver (Ag) content then lookup the specific processes and multiply the cost per oz with the intake ounces. I have attempted to combine IFS and Xlookup for each process separately but the formula looks very unwieldy. I am also enclosing a slightly simpler formula of IFS and sum where the total cost is calculated in one cell (Q12).

Here is the link: https://docs.google.com/spreadsheets/d/1hizmF6EwhxOPEeR10bXJsBOKeOtXude8/edit?usp=drive_link&ouid=103354753371375324640&rtpof=true&sd=true

I am looking to see if I can have a more dynamic iteration of the formula in Cell Q12 as well as in the calculation of the individual processes in Row 4 , Cols P:V. Thank you.

Regards,

Shams.