Have a cell for the support hours. I'll assume A1 contains this
number.

In cell B1, you want the total charge to appear. Type the formula

=IF(A1<=105,12500,12500+(A1-105)*125)

So, if a1 is less than or equal to 105 hours, the charge will be
$12500
If a1 is greater than 105 hours, the charge will be $12500 + the number
of hours over 105 multiplied by your hourly rate.

See how you go.


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