Where did you get this industry standard amount? Is there a published book that I don't know about that I should be referencing?? Are there other industry standard amounts that we all should be applying?
Yes, I am being facetious because there are no industry standards. Making this comment and marking it in bold makes it sound like you have authority on the issue but in fact it is farther from the truth. Just the comment 'however this amount can be lower or higher' proves that it is not a standard but an oxymoronic statement.