Cost-Sell-Margin-Tax-Calculator-10-Digits-Desktop-Sharp-EL331FB-Sharp-EL331FB-The-Sharp-EL331FB-is-a-modern-looking-desktop-calculator-that-comes-in-a-contemporary-white-finish-Based-on-Sharp-39-s-best-selling-desktop-calculator-series-the-EL331FB-features-all-the-standard-Sharp-calculator-features-together-with-a-time-saving-TAX-function-that-cuts-out-as-much-as-6-additional-key-presses-A-useful-new-function-to-this-range-is-the-COST-SELL-MARGIN-feature-which-is-an-indispensa