I already have a working Excel sheet and now need it expanded so it captures quarterly sales figures in a clean, automated way. Please add the necessary columns for each quarter and build formulas that return both the total sales amount for every period and the sales-growth percentage from one quarter to the next. If you feel the structure should also anticipate other metrics—say, units sold—I’m open to suggestions, but the two items above are mandatory. To make the update practical: • Insert clearly labeled columns (Q1 to Q4) and a summary area that rolls up the yearly total. • Set up growth-rate calculations that remain accurate when new quarters are appended in future years. • Keep the layout consistent with the current sheet’s formatting so existing references do not break. I will supply the file as soon as we start; you return the enhanced version, error-checked and ready to use.