I was not talking about San Francisco or bay area but US. I have some friends working for Google and they earn 2x0K in Pennsylvania and Texas. I do not dare to

I was not talking about San Francisco or bay area but US. I have some friends working for Google and they earn 2x0K in Pennsylvania and Texas. I do not dare to dream to earn same amount of money like US employees but just wonder why it is so low like one third. Does anyone know the secret formula to estimate local pay? And years ago I finished my Master degree in US and went back to Taiwan because of family. I do not want to live in US.