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Calculation helps us when preparing menu :

*Because when the time that you need to computed specially in a restaurant you have to master computing.
*It's important to know to calculate because almost of the people need it ,specially when selling some goods or other resource . When the time there is a change in the costumer .You have to think the particular change you have to give.
*Whether you are running a restaurant or just want to find out how much it costs to prepare a dish.
*It's helps to regulate quicker time to make.
*Give us a significance ability to compute well.

:)) -COLLINSDAX "at your service"