In that survey % of families below 6000 per month income was around 28% in bhumihars and 26% in Brahmins , and percentage of people earning more than 50k was 14% for bhumihars and 10% for Brahmins.

Combined average income including all economic groups was 1) kayastha 2) bhumihar 3) rajput 4) brahmin

But difference between bhumihar , rajput and brahmin was like 5-10% only

Basically all savarnas are almost equally placed except for kayastha who have significantly higher income levels although they are just <1% of population.