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diameter 86mm (3-5/32") Types of Calculations Mark-up/mark-down calculation. Memory calculation. Percentage calculation. Add-on calculation. Discount calculation. Percentage increase and decrease calculation. Average calculation. Par mode calculation. Mixed calculations. Addition, subtraction, multiplication and division. Repetitive addition and subtraction. Chain multiplication and division. Constant multiplication and division. Raising to powers. Reciprocal calculation. Sum and difference of p