I am told to create a report which is below but it says to use the COUNTIF, AVERAGEIF and SUMIF functions. And then to add a total at the bottom.
Ok I am confussed; can someone help me out wth this?

Customer Type Nbr Customers Avg Gallons Used Total Billed
Commercial 37 322,437 37,043.12
Nonprofit 11 87,661 224.18
Government 24 774,532 27,901.44