Renting of Motor Cab

if  petrol/dizel   provided by you then 18 %   other wise  5%  

in that  case  5%  only

My business is to provide cab services.Rite now i don't have any cab.I used to purchase cab from travel agents and then provide it to my customers.

E.g.  I buy from ABC associates cab of Rs 15750 (incl gst of rs 750) and then sell it to my customer for 16800(incl gst of rs 800) now wat amt. i hav to pay to the govt. under GST  rs 800 OR rs 50 (i.e. 800 minus 750)   ????

 

Sir, Please let me know the sac code for the same service , if GST rate is 5%.