A market stall's prices were typed into a spreadsheet by hand, so the column is all text. Most entries are proper numbers like "2.50" or "3", but some aren't: "free", "n/a", an empty "", or "2,50" typed with a comma.
Write price_check(prices), where prices is a list of strings. Convert them to numbers, treating anything that can't be read as a number as missing.
Return a list of two values:
0.0 if none could be read)If prices is empty, return [0.0, 0].