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The discount must be calculated first to get the base price of the item, then the tax percentage would be taken into consideration, otherwise you would be charging additional tax on an item which should be discounted in the first place. If you were to calculate tax first then the discount price, your total would be incorrect.
In China in 1960
Abacus was the first calculating device invented by the Chinese.
Calculating clock is the first known calculating device made by Wilhelm Schickard. This machine can perform the basic mathematical operation, but canÕt show too large result which is limited to six digits.
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