The DF-120BM large desk calculator is equipped with varied pre-set calculation functions for TAX, profit (cost, sell, margin) and percentage. This independent memory calculator has additional supporting features for accuracy which include, rapid correction key, grand total memory and rounding selections. Percentage Calculation incl. Profit Calculation (Cost, Sell, Margin) TAX-Calculation 3-Key Memory 3 Digit Comma Markers Function Command Indicator Key for changing plus/minus sign Grand Total-Memory Rounding selector (0,1,2,3,4,ADD2) Automatic rounding-off F, CUT 5/4 Back Space Key Double Zero Key