not sure how to calculate returns on excel

price column to your assigned company name. 4. Merge the company and SPY data. Keep the columns for date, company close and SPY close and delete the rest. 5. Calculate returns [(P1PO)/PO]100 for your company and SPY. Select the date, company return and SPY return and insert a chart XY scatter with smooth lines and markers. 6. Calculate the mean and the standard deviation of your company returns and SPY returns using the excel functions AVERAGE and STDEV. 7. Calculate beta for your company. Use the Excel Slopeh function (company returns are Y s, SPY returns are X s). Compare the results to the posted beta for your company in Yahoo finance