The research for the feasibility study or for the business plan should be done on similar businesses. For example if your planned business is retailing household items then check on stores with that kind of business and also with the same size as what you plan.This is why it is advisable to first conduct a feasibility study and market survey to determine all the necessary things you need to start up the business. From there you will be able to know the exact amount you need to start up you business and many other important things.