Column C has numeric values
Column F has numeric values
Column M has numeric values

What I would like to do somthing like the following:

=SUMPRODUCT(MIN(C10:C21,(1099.41-F10:F21)),M10:M21)

In English - subtract each value in column F from 1099.41, come up with a
stream of 12 numbers compare these twelve numbers to the 12 numbers in column
C and use the lessor (by row) and multiply this result by the values in
M10:M21 (if the lessor of the two number is negative , zero will be used)

Example
Column C Column F

100 100 .08
100 200 .08
100 300 .085
100 400 .085
100 500 .085
100 600 .095

Subtracting 100 from 1099.91 = 999.91 compare that to 100 the lessor of the
2 is 100. Multiply number by .08 to yield 8

The final number would compare 99.91 to 100 the lessor of the 2 is 99.91.
Multiply this number by .095 to yield 9.49

The number in column C will not always be constant but Column F will always
be the sum of column C.