$15.$ Eva wants to display the payments customers made in each of five regions where Porter $360$ does business.

Insert a recommended PivotTable based on the Orders table as follows:

a$.$ Insert the Sum of Payment by Region recommended PivotTable.

b$.$ Use May Sales by Region as the name of the new worksheet.

c$.$ Apply the Sky Blue, Pivot Style Medium $13$ style to the PivotTable.

d$.$ Add a second copy of the Payment field to the Values area of the Field List, and then change its summary function to Average so that Eva can compare the average payments to the totals.

e$.$ Change the number format of the two value fields to Currency with $2$ decimal places and the $ symbol.

f$.$ Use Total Sales as the column heading in cell B$3,$ and use Average Sales as the column heading in cell C$3.$