You need to use the IF function. Something like:
=IF(C12*D12<100,100,C12*D12)
In effect a cell in Excel is a box where either text, number or formula can be placed.
=b1^c1
A cell is a rectangle that can hold a number, text, formula etc.
The formula bar.
Which of the following is a number that can be entered into a cell?
first
In Excel an equation can be a formula. All formulas in Excel must start with the equals sign. That is what tells Excel it is a formula.
formula
There is a function called ROUND which you can use to round to zero decimal places. If your number was in cell A2, the formula would be:=ROUND(A2,0)
A formula.
All formulas must begin with the equals sign. That is how Excel knows it is a formula.
A green arrow in the corner of an excel cell means that excel suspects soemthing may be wrong with the formula in a particular cell.