I am trying to get Excel to calculate commission based on different factors.

In column B I have "number of units" - if the value is less than 10 the
commission is .0025, if the value is greater than 10 the commission is .0035.
But there is more....

In column F I have dollar amounts that can also change the same commission
amount. If the value in column F is 199,999 or less the commission amount is
..0025, if the value is 200,000 - 499,999 the commission amount is .0035 and
if the value is 500,000 or more the commission amount is .0040.

The commission amounts that are referenced will go into column D.

Scenarios -

9 loans and less than 199,999 in column F should calculate .0025 commission.

9 loans and 350,000 in column F should calculate .0035 in commission.

10 loans and 150,000 in column F should calculate .0035 in commission.

The dollar amount that the commission rate is calculated off of is in column
C.

I would appreciate any help I can get. I have spent hours on this and I
can't figure it out.

Thanks in advance,