GST on two wheeler sub-agent.

I m trading in two wheelers.

I purchase vehicle from authorised dealer and sell it to end consumer.

I rec'd 52000 cheque from customer in my name.

and paid the dealer RS.50000 (inclusive GST) from my account. and rec'd bill in the name of customer. for each. 50000
bcz RTO requires authorised dealer s invoice for registration of vehicle.

my revenue is only 2000 which is less than 20 lacks in a year.

m I require to pay GST...?

if yes.. on what amount.

pls reply with relevant provisions.

thanx