The Rounding Mechanism only applies to the total amount of a bill and not on individual items. In the Rounding Mechanism exercise, the total amount of a bill which ends in 1, 2, 6 and 7 sen will be rounded down while the total bill which ends in 3, 4, 8 and 9 sen will be rounded up to the nearest multiple of 5 sen.
The table below illustrates how the Rounding Mechanism works:
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