1/10 and 1/100 are both fractions. If 1/10 of the salary of a developer is saving 1/100 of that developer's time, you lost. Fractions are not equal, blanket statements about fractions are not good business practice.
that is why I wrote "that fraction", hoping that it means that its the same fraction.
Though, your example still does not mean you lost. that 1/100 time is time that developer is not working on something else, that might be worth much more (though if ita 1%, its less likely. but my point is that developer time is more valuable than proportional amou t of his salary).
