Commercial dual power desktop calculator offers a 12-digit liquid crystal display (LCD) with automatic 3-digit punctuation. Multiple Use key simplifies business calculations to save time and increases efficiency by handling functions like margin markup selling prices costs percent changes. Functions include independently accessible four-key memory plus second two-key memory function round up/off/down add mode fixed (3 2 0)/ floating decimal and Constant and Sigma mode selectors. Solar-powered operation with battery backup prevents memory loss. Twin power sources include built-in solar cell and lithium cell. Calculator includes adjustable stand and carrying case and weighs .64 lb.