$(1$ point$)$ Micron, Inc. has a three$-$stage production process with yields of $80\%,85\%,$ and $90\%$ respectively. Rework is allowed only at the final station. If the rework percentage is $50\%$ and $100$ units are started down the line, how many good units will be produced?

$64$

$30$

$61$

$80$