Chapter A1, Problem 10PE

The Excel file Store and Regional Sales Database provides sales data for computers and peripherals showing the store identification number, sales region, item number, item description, unit price, units sold, and month when the sales were made during the fourth quarter of last $\text{year}{\text{.}}^2$ Modify the spreadsheet to calculate the total sales revenue for each of the eight stores as well as each of the three sales regions.