Description of the illustration prc_ro_21_41_rollover.gif

The figure shows the balances after the March minutes rollover. For rollover, the values are Initial_amout: 100, Cur_amt: 100, and Valid_to: 4/1. For January, the values are Initial_amt: 500, Cur_amt: 400, and Valid_to: 2/1. The new sub-balance values for February are Initial_amt: 100, Cur_amt: 100, and Valid_to: 4/1. The original sub-balance values for February are Initial_amt: 500, Cur_amt: 400, and Valid_to: 3/1. For March, the values are Initial_amt: 500, Cur_amt: 500, and Valid_to: 4/1.