Margin scheme; second hand car daler

This query is : Resolved

kishan (Querist)
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01 August 2018 Dear All,
Background: There is a registered auto dealer (new cars) who is also engaged in purchase and sale of second hand cars.
Query1: can he take benefit of margin scheme and any intimation to the department or mention of the same on invoice is required.
If yes
Query2: Can he collect GST from customer or it has to be like composition scheme?
Say purchased a vehicle for 1,00,000
sold for 1,10,000
Margin 10,000
so amount to be collected from customer should be 1,10,000+1800 (say GST rate on margin is 18% so 10,000 X 18%) or else it should be 1,10,000 only?
In case it can be/ has to collected separately than
Query 3: will it not disclose the margin to the customer and indirectly hamper the business?
Query 4: can we skip the invoicing part?

reference to sections/rules number of act will add greater value to your reply.