exempt supplies in composition scheme

hemant thakkar (21 Points)

24 April 2017  
sir
I have business with turnover under 50 lakhs of exempt supplies but above 20 lakhs.
according to aggregate turnover definition I will be in composition scheme.

but all my supplies are exempt so do I have to register for GST act?

what will be the tax?

if there is any tax then why as I am suppling only exempted goods?

thanks