Q07. Revenue per service. 'units' is kg, items or pairs.   [12 row(s)]
id    | price    | bills | units | charged     | pct
------+----------+-------+-------+-------------+-----
S0001 | 8000.00  | 1368  | 8531  | 67632000.00 | 46.9
S0002 | 12000.00 | 405   | 1540  | 18360000.00 | 12.7
S0008 | 35000.00 | 170   | 232   | 8085000.00  | 5.6
S0004 | 20000.00 | 157   | 390   | 7800000.00  | 5.4
S0003 | 6000.00  | 256   | 1251  | 7506000.00  | 5.2
S0011 | 45000.00 | 124   | 165   | 7425000.00  | 5.1
S0009 | 25000.00 | 128   | 247   | 6150000.00  | 4.3
S0005 | 65000.00 | 64    | 79    | 5135000.00  | 3.6
S0010 | 15000.00 | 47    | 324   | 4650000.00  | 3.2
S0006 | 45000.00 | 82    | 103   | 4590000.00  | 3.2
S0007 | 40000.00 | 78    | 104   | 4120000.00  | 2.9
S0012 | 30000.00 | 74    | 92    | 2760000.00  | 1.9
