(solution) `I have a buddy who recycles electronics, and isolates metals

(solution) `I have a buddy who recycles electronics, and isolates metals

`I have a buddy who recycles electronics, and isolates metals from the connector pins electrical boards. He isolates gold, for example, and purifies it the best he can, then sells it along with his other scrap metal. This last go around he was able to isolate 3.00 g of Au with a process he claims results in a 80.0% yield. If he is correct, what was his theoretical yield? In other words, he got 3.00 g, but what should he have been able to get?

A.80.0 g
B.3.75 g
C.0.0375
D.2.40 g
E. none of the above