MajoReduc, your companion for clearance sale! Calculator percentage. MajoReduc is a free application to calculate percentage (increase, decrease in percentage. ). Clearance sale. This mode lets you quickly know the price of a sold out item. Tests. This application was tested on: Nexus 5: Android Marshmallow (6. 0. 1). Nexus 7: Android Lollipop (5. 1. 1).