Using the following case study, draw a physical flow data diagram:

Fred's Electrical, Inc. sells electrical parts to electrical contractors in the northwestern United States. Fred's customers mail their payments - attached to the stub(ie: remittance advice [RA]) from their monthly statements - to Fred's accounts receivable (AR) office. An AR clerk confirms that the check amount agrees with the amount on the RA and sends the checks to the cashier. The AR clerk prepares batch totals of the customer numbers, invoice numbers, and amount paid. The AR clerk then enters the batch totals and RAs into the computer, where the AR master data are updated to record the payment. The computer reconciles the batch totals, confirms job completion, and reports discrepancies, if any, to the AR clerk.