Currently doing a study on the Commercialization Potential of Product Packaging made from Rice and the respondents are divided into two: End-user of product packaging and the business owners
To know the minimum amount of sample, it is interesting to take the target population of the work and calculate the sample. There are several tools for this calculation, I suggest OPEN EPI. Available at: https://www.openepi.com/Menu/OE_Menu.htm
For example: The target population of this work is (number of entrepreneurs in the city or country). to have a sample
with an ideal level of reliability, a calculation was performed in the OpenEpi version 3 application, making it possible to use a satisfactory sample.
In Open Epi click on Sample Size and then on proportion and then enter data, type population size and click on calculate. Ideally, use a 95% confidence level.