1. Fill in the calculations for sales revenue, total cost, and gross profit columns in the Data worksheet. 2. There are some typographical errors in the data set in the Region fields. Find and correct these errors by using a pivot table. Analyze sales revenue by inserting a pivot chart that shows the sales revenue trend by region over the four-year period. 3. Analyze sales revenue, variable cost, and contribution margin for each year for each region using a pivot table. 1. Fill in the calculations for sales revenue, total cost, and gross profit columns in the Data worksheet. 2. There are some typographical errors in the data set in the Region fields. Find and correct these errors by using a pivot table. Analyze sales revenue by inserting a pivot chart that shows the sales revenue trend by region over the four-year period. 3. Analyze sales revenue, variable cost, and contribution margin for each year for each region using a pivot table