Use clear headings, labels and units. In any case, make sure that your spreadsheet is well labeled to avoid confusion. This is where the user would go to find the answers which solve the problem. The user may or may not be interested in seeing these results. Use of intermediate results can often simplify the formulas in the output section.
Simplicity helps defend against error.
Intermediate values could be hidden from the user, placed off to the side of the spreadsheet, or left in plain view. It depends on the type of calculations and the interests of the users. There is only one spreadsheet to create for this project and it involves calculating the travel costs for a group of students planning a trip. Your student group is planning a trip to Florida over break. You have been put in charge of travel plans, specifically, you are to make a cost estimate for the trip.