+--------------------------------------------------------------------+
| AccountNO  Serial      Due                   Balance               |
| ---------- ----------- --------------------- --------------------- |
| A1         1           1000.00               3100.00               |
| A1         2           1000.00               3100.00               |
| A1         3           1000.00               3100.00               |
| A2         1           100.00                3100.00               |
| A2         2           100.00                3100.00               |
| B1         1           1000.00               1100.00               |
| B2         1           100.00                1100.00               |
| B2         2           100.00                1000.00               |
+--------------------------------------------------------------------+