A microprocessor plant that manufactures computer chips costs $\$400,000$ per day to operate. It costs $\$30$ to produce one chip which sell for $\$190$ dollars. How many chips does the plant have to make to break even on one day operation?
Let $X$ be the number of chips I need to make.
$400,000 = 190X-30X$ (but I'm not sure this is even right). I'll continue anyway, I'll check it later...
$400000 = 160X$
$2500 * 190 = 475000$ (its wrong)
Can someone help me? I think that formula I have is very wrong and I can't figure out another one...