I don't have the numbers but it seems very likely to me that Google spends a lot more than this on maintaining and improving Android and this alone would not be enough to put them in the black.

Goldman Sachs seems to think Google is paying Apple nearly $10 billion.

https://www.thestreet.com/investing/google-pays-apple-billio...

Google could easily support Android with $100m a year if that.

Sure, but also assume any other player that wanted to be the default search engine on Android to also pay Android a similar amount..