# How are chemical formulas constructed?

Chemical formulas are deducted from the chemical composition of a substance; and the chemical composition is established by chemical analysis.

### Can the IF function in Excel create a field on the summary sheet that would compute late fees if the invoice has not been paid by the due date?

You could use the IF or SUMIF function to do that. There are potentially lots of ways of doing it. How the formula or formulas are constructed is going to depend on the structure of your data. You could use the IF or SUMIF function to do that. There are potentially lots of ways of doing it. How the formula or formulas are constructed is going to depend on the structure of your data. You…