We are Angel NX and we are solving business problem by Making of Innovative Applications for Regular Usage and Business Purpose. CALCULATOR App gives you all functionality of CITIZEN CALCULATOR with additional functionality including GST buttons of +3%, +5%, +12%, +18%, +28% and -3%, -5%, -12%, -18%, -28% with just one Single Click for India. Calculate like Citizen Calculator and many other calculators. Calculator App holds many features for simple calculation like (+) Addition, (-) Subtract