As defined by the courts, "extra work" means work of a nature not contemplated by the parties and not controlled by the contract. "Additional work" means work that is necessarily required in performance of the contract, even if unforeseen conditions arise. Extra work is work outside of the original contract obligation and is entitled to additional compensation. Additional work just means more work was required than originally estimated, and no additional compensation is due.
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Differentiate between work study and method study.
The difference between research and evaluation is that research is were you find out about something and evaluation is were you say what you think of your work how you can improve it you usually evaluate your work once you Finnish something.
Qualitative usually refers to the quality of the work, how good, or bad, the work is. Quantitative refers to the amount, or quantity, of the work.
To work that out you could do 20'000-11'111=8'889 Or 8'8889+11'111=20'000.
Work out the difference between 180 and 171 (9) and divide that by 180. Multiply that by 100 to get the percentage difference (5%)