HP Designjet 5500mfp Color Manual page 21

The Accounting feature helps keeping track of your copy activities. It may be
used to record your copy expenses and for billing your customers. The
accounting system records the number of times the system scans, prints, and
copies. The number of square feet or square meters for scanning and printing
activities is calculated from the Input size and Output size settings. The
calculations for paper usage (in square feet) take into account the full media
width and not just the printed image. When using the accounting feature, please
note that if you cancel a print or copy job, the accounting fields are increased as
if the job was not cancelled; on the other hand, if you cancel a scan job, the
corresponding fields are not increased.
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Color Reproduction for the HP Large Format Color Copiers family: cc800ps, 815mfp, 5500mfp and 4200 scanner