This practice will help the students see the logic of formulas in spreadsheets. Before you go to the lab, you may want to talk about cell formatting issues. You will probably want to use the currency format for some columns. You'll want to make sure that the other cells are also formatted to show decimals to the 100ths place. Discuss how many place values are needed and how to format for the desired place value.
Students can make notes on their planning sheets about format to use for various cells.
You may want to use a template that you have prepared or have students use their own that they have prepared in class. Enter the numbers, text, and formulas from the sheet. Make sure that they double check their work. This activity will enable students to see if their answers make sense. Discuss the spreadsheet.