What I would think you'll do is given them a conservative estimate based on the rate you're being paid per line?
Does that make sense? Have I understood your question correctly?
... having just read your "already tried" comment ...THY THIS: (if you can think back through the various projects you did, at 19.81 per hour): ... Let's say, for example, you worked on one piece for more than a full day, and you remember, or can pinpoint,where you were, at the end of the first day ... You can then count the lines, and divide the pay you made for the day by that number of line (the lines completed in that full day).
This would, of course, also work for any other project you did, (where you can go back and count the lines and pinpoint how many hours you worked on it).
Let me know if I can help further, or you'd like to drill down on this some more. ... I still don't see you coming into the chat here, so I'll move us to the "Q&A" mode, so you can ask any follow-up questions....
Let me know,
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What I am trying to find out is the mathematical way to figure out - if the work I have just done adds up to say $42.44 by line count method, how do I convert this into 'hours worked' at $19.81? Hopefully you are more mathematically inclined than I am.
If you’d like to work with me again, say “For Lane only …” at the beginning of your question.