Calculation method (@Sampling plans / Create sampling plan, Sampling plan details / Rules)

The calculation method should be set to Fixed if you want to use the sample size value directly. In this case, the operator will take as many samples as the numeric value entered in the Sample size field. Select Percentage as your calculation method to interpret the numeric value entered in the Sample size field as the percentage of the total quantity of items. In this case, a Sample size value of n means that the number of samples will be the n % of the total quantity of items.