PTR (Price To Retailer): This is the rate at which the medical retailer purchases medicine from the stockist or distributor.
PTR = (MRP - (MRP * (Retail Margin / 100))) / (1 + (GST / 100))
PTS (Price To Stockist): This is the rate at which the stockist purchases medicine from the pharma company.
PTS = PTR - (PTR * (Stockist Margin / 100))