A small coffee chain sends its weekly numbers: sales per shop and day, prices as text, and survey ratings. Each task here is shortest with one of the standard library modules from this unit.
Choose the module before writing a loop: running totals and pairs come from itertools, summaries from statistics, money from decimal, and presets from functools. A loop that works is still a right answer, but the module version is what colleagues will expect to read.
The data changes on the hidden check, so nothing should depend on the numbers you see.