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MailStream Plus How come there are inconsistencies in the Consolidated and the individual USPS Statement 3541 totals

The advertising percentages and the rounding of the percentages determined by the USPS rules around rounding and found in the DMM 604.7.
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When a user runs two separate presorts and merged them together into one .MDT file causes MailStream Plus to look at the presort job setup as one mailing.
This causes the advertising percentages for the two separate jobs to be calculated and rounded as a whole new presort.
USPS rules around rounding in the following section of the DMM 604.7

7.1.3 Rounding Numerical Values

For these standards:

a. Round off requires increasing by 1 the last digit to be kept if the digit to its right, which is not to be kept, is 5 or greater. If that digit is 4 or less, the last digit kept is unchanged (e.g., 3.376 rounded off to two decimal places is 3.38, 3.374 is 3.37).

b. Round up requires increasing by 1 the last digit to be kept if there are any digits to its right, regardless of significance (e.g., rounding up either 3.3701 or 3.379 to two decimal places yields 3.38).

c. Round down requires eliminating any digits to the right of the last number to be kept (e.g., rounding down either 3.371 or 3.379 to two decimal places yields 3.37).

UPDATED:  September 5, 2017