$0.12335
I'm assuming you mean 12.3 cents per mbit. I think a better way to express the exchange rate would be mbits per dollar.
The current exchange rate on Clark Moody is $123 per BTC. Well that is $123 per 1000 mbits which is 8.13 mbits per dollar. Just my 162 ubits. Haha I crack myself up
I prefer $/
mBTC because I am usually buying Bitcoin with dollars, not the other way around. It makes it easier to visualize how much I am actually paying since that's how I've historically watched the price.