GST Margin scheme on second hand material purchases

Hi

Could you delight suggest to configure the pricing to procure 2nd manus materials, wherever the GST is to beryllium see connected the Marginal worth and not connected full worth of, For Ex: if a seller selling 2nd manus bottles @ Rs.10/- retired of which the Margin strategy (taxable) worth is Rs.4/- past GST volition beryllium charged connected Rs.4/- @ 18%, truthful full measure worth volition beryllium Rs.10.72/- (6 + 4 + 0.72)

Regards

Bhanu prakash