GST on Room & Food

Dear Experts,

Do help to resolve the following query 

1.  For example  first day we are selling rooms  in two different tariff like Rs.7400  & Rs.8000 (GST on Room for Rs.7400 is 12% & Rs.8000 is 18%)  GST how much we have to charges in F & B ?
2. Second  day we are selling room rate  Rs.7400 only not more than that,  (GST on Room for Rs.7400 is 12%)  GST how much we have to charges for F&B ?

Whether  room GST is also correct or not, apart from that we are concern about food GST for In Room Dinning & Restaurant too.

Please do share your valuable reply

Regards

Saravanan