Net Discount after series of discounts Net Discount= (1- 1st discount%) X (1-2nd disscount %) and so on E.g. Discount on shirt 10% on 30% Net discount = (1-0.1)(1-0.3)=(0.9*0.7)=0.63 or say 63 % net discount Lets check this formula on shirt mrp 100 Rs. After First Discount =100-100*(10/100) =100-10 =90 After Second Discount =90-90*30/100 =90-27 =63 Percentage Change = Price After Discount / Original Price *100 =63/100*100 =63%