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, a rapid correction key, grand total memory and rounding selections.12 digit large LCD Display, dual power, percentage calculation including profit margin, profit calculation (cost, sell, margin), tax calculation, 3 key memory, key for sign change +/-