MONTH()
If cell A1 holds the value 5/19/2009 (M/D/Y) then the formula =MONTH(A1) returns the value of 5, the month from that date.
SUMPRODUCT()
Used to sum a range after using other range/criteria to filter down.
LOOKUP(Value,LookupRange,ReturnRange)
You original question is of the LOOKUP variety. You want to find a total amount money in a particular date range (Value), then lookup that value in your original chart to find the corresponding Bonus:
One of the benefits of LOOKUP is that it rounds down, so 44000 matches the 40000 range.
So, now you can use that entire process to build up on huge formula encompassing all those pieces, like I illustrated in the previous post.
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