The problem wasn't complicated, given an invoice date and a set of usages, compute the total cost. The problem was the programming environment. I should have moved the code to a proper IDE to complete which would have been much more efficient, however I ran out of time dealing with the Woven IDE quirks. Then there's a database problem and system troubleshooting exercises. The database problem is confounded by not providing any details on the sql engine or what functions exist. Some functions did not work. It was frustrating