Tim enters a competition and has to try and guess the number of red jelly beans in a jar.  The jar has a square base and is 6 inches by 6 inches and 15 inches tall.  He knows that a jelly bean is .15 cubic inches.  He also knows that they get about 80% efficiency in packing.  He estimates 30% of the jelly beans are red.  The true number of red jelly beans in the container is 900.  How far off was his guess?
Please reason step by step, and put your final answer within \boxed{}.
user