Index Match Return Value based on two variables and number range

Hi, I am trying to get a result from two variables.
Variable 1 is a name, say Ian. Variable two is a number (number of sales).
If Ian hits a number of sales, then a certain commission value will be returned.

If Ian hits 999 sales, he gets a different commission to 1000 - there are various stepped targets like that.
To clarify on the sales, the steps will be broad, say 100, 250, 500, 750, 1000. However the sales may be exact like 359 - should return the commission for 250. 748 should return commission for 500 - only if it meets or exceeds 750 would it hit the 750 commission.
Different people have different sales targets and commissions.

The commission value will change for each person depending on their respective sales target. I want to see that in the list of names.

Can anyone help based on the information I have set?

I've tried to use index match but not getting it right so far.

Magic, this works - thanks!