I've been using Excel for some time now (Office X) and there is a calculation that I would like to know how to do: I have columns down with item, cost, quantity, etc. How would I get the quantity and cost to total up? In other words, I might have 3 of an item at $16.99 each. How would I go about getting a cell to calculate the total of all 3 items? How about another cell to calculate tax and then total? Any Excel users out there that could help?