Exercise 7.2. The five busiest days of the year, all outlets together.   [5 row(s)]
day        | bills | charged
-----------+-------+--------
2026-03-09 | 21    | 967000
2026-04-11 | 20    | 873000
2026-09-06 | 20    | 820000
2026-03-28 | 18    | 886000
2026-03-31 | 18    | 768000

