1. Go to the Customers worksheet. Ravi wants to create PivotTables that include customer, contract, and invoice data. He already added the tables containing this data to the Data Model. Ravi wants to list and total each contract amount by city and signing date. Create a PivotTable that displays this information as follows:
   1. Use Power Pivot to create a PivotTable on a new worksheet, using Contracts by City as the name of the worksheet.
   2. Display the City data from the Customer Query as row headings and the SigningDate data from the Contract Query as column headings, and then sum the ContractAmt values from the Contract Query.
   3. Display the signing dates as years and quarters only. (Hint: Expand the year headings to display the quarter headings, if necessary.)