Q28. Cancellations and complaints per outlet, from the audit trail.   [3 row(s)]
outlet | bills | cancelled | complaints | complaint_pct
-------+-------+-----------+------------+--------------
O01    | 1312  | 8         | 21         | 1.6
O02    | 996   | 11        | 11         | 1.1
O03    | 645   | 2         | 12         | 1.86
