Question 1081107
true 12x=280+4x
8x=280
x=$35, and which point R=C=$420.
Try x=20 to see what happens.
Revenue is $700
Cost=280+$140=$420.
He will make a profit.  This could also be seen by the fact as x increases, it favors the revenue function with 12x, rather than the cost function with 4x.