GoogleがAndroidで3兆6000億円以上の収益を上げていることが明らかに - GIGAZINE
http://gigazine.net/news/20160122-android-revnue-31-billion/
Android has reportedly generated $31 billion in revenue for Google | Android Central
http://www.androidcentral.com/android-has-reportedly-generated-31-billion-revenue-google