What's more, his figures work out to 5.3 weeks of work at 40hrs/week, for the equivalent of one month's rent (not one month's living expenses). Be a shrewd manipulator of globalization if you want, but don't try and justify away the raw deal you're giving someone to save a few bucks, especially considering those bucks would be far more valuable to the guy doing the work than the guy who is saving them.
A relative used to do transcription so while in the worst case it may take 4x as long (bad audio + intelligible speaker) he often worked at about twice real time. So that 15$ / could be anywhere from 4$/hour to 30$ an hour.
PS: At those exchange rates 66,400 Shillings = 800$/month rent which seem really high. I know people in the US paying under 600$ / month rent for fairly reasonable apartments near major city's.