There is no single formula since the models that are used vary quite considerably in terms of their complexity.
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I think the best formula in solving for work is labor, determination and sincerity.Of course, you should have thorough knowledge before solving for work.
Most people are not statistically trained so the probability of whether or not you are forecasting is so close to 0 that knowing its value is of little help.
Overhead cost is part of total cost and not different from total cost as formula is as follows: Total cost = material cost + labor cost + overhead cost
Quantitative forecasting tools are used to predict future figures and quantities such as sizes and lengths. Qualitative forecasting tools are used to predict what something in the future will be like in terms of things other than set figures. For instance, they could predict what type a future element will be; what color it will be; what the nature of it will be.
So that if you plan something you know that it will be raining that day or sunny.