What is the math formula? Using two inputs?

Question

I have 2 inputs A & B. Input to A can be 150, 300, or 600. B input can be 0 to infinity. Here are the variables below.

If A=150 and B is less then 500, multiple B*0.29
If A=150 and B is between 500 to 5000 then multiple B*0.25
If A=150 and B is greater then 5000, multiple B*0.20

If A=300 and B is less then 500, multiple B*0.39
If A=300 and B is between 500 to 5000 then multiple B*0.35
If A=300 and B is greater then 5000, multiple B*0.30

If A=600 and B is less then 500, multiple B*0.49
If A=600 and B is between 500 to 5000 then multiple B*0.45
If A=600 and B is greater then 5000, multiple B*0.40
Thank you, AL

Answer 1

I don't think you'll like this answer, but what you have listed is about the best you can do. You can't reduce that to a simple formula.