Also operation XDECI can be used for rounding.
In both ROUND and XDECI, the help text has examples of how to use.
You can try with different input values for the PCR and decide which you want to use.
Further many installations use multiplying the rate by a T511K constant 100,000 (e.g., GENAU for Australian payroll) before any division, then after all calculations are completed for a w/t and before the w/t is added to RT, CRT or cumulated to /1xx, etc, the rate and amt are divided by the same T511K constant restored to normal no.of decimals.