Hector runs a one-product widget shop. Each month, his fixed costs, whether he produces anything or not, amount to x dollars. The marginal cost of producing and selling one widget is a constant y dollars, regardless of the number he produces. He generally can sell widgets for z dollars each. What is the minimum number of widgets he must produce, assuming he sells every widget he produces, to break even (neither make a profit nor incur a loss) in a given month?	Choose one.
A) x/(y - z)  B) x/(z - y)  C) x  D) x/z  E) x/y
Two ways...   1) let t be the total number, so cost = t*y+x and selling price=t*z..   No profit no loss....t*y+x=t*z.....T=x/(z-y)...   2) choices..   The answer has to use all 3 variables x,y and z....   Only A and B are left...   In A, y will be lesser than z, so A will become NEGATIVE..   ANSWER:x/(z - y)
<result>B</result>
Hector runs a one-product widget shop. Each month, his fixed costs, whether he produces anything or not, amount to x dollars. The marginal cost of producing and selling one widget is a constant y dollars, regardless of the number he produces. He generally can sell widgets for z dollars each. What is the minimum number of widgets he must produce, assuming he sells every widget he produces, to break even (neither make a profit nor incur a loss) in a given month?