The Casio SL-310UC Calculator is perfect for taking to school or keeping handy at home or work | Automatic calculation of price plus tax, price less tax, discount, selling price, tax amount, discount amount, and margin amount | Time calculation allows easy input and calculation of hour, minute, and second values | Solar powered when light is sufficient, battery powered when light is insufficient | Function command signs - A symbol (+, -, x, /) on the display indicates the status of operation you are currently performing | Key operations are stored in a buffer, so nothing is lost even during high-speed input | Larger display makes more data easier to read | Designed and engineered for easy operation | Profit margin percent key gives quick access to prices and profits, and also delivers add-ons, discounts, ratios and increase/decrease values | 10 digit display