Description of the illustration prc_ro_11_31_rollover.gif

The figure shows the rollover balance for minutes. For rollover, the values are Initial_amout: 100, Cur_amt: 100, and Valid_to: 3/1. For January, the values are Initial_amt: 500, Cur_amt: 400, and Valid_to: 2/1. For February, the values are Initial_amt: 500, Cur_amt: 500, and Valid_to: 3/1.