https://s0.wp.com/latex.php?latex=D+%3D+1+-+%5Cfrac%7B+V_%7Binmin%7D+%7D%7B+V_%7Bout%7D+%7D+%3D+1+-+%5Cfrac%7B+11.9+%7D%7B+25+%7D+%5Cequiv+D+%3D+52.4+%5C%25&bg=ffffff&fg=666666&s=0&c=20201002