Gotta love "I don't need to show my work! It's self-evident!" It's not self-evident, or the person wouldn't have asked for a source. And you have numbers that

Gotta love "I don't need to show my work! It's self-evident!" It's not self-evident, or the person wouldn't have asked for a source. And you have numbers that you're pulling from "somewhere" without sharing a source for them, which means it's even further not self-evident.