Question 1046559
Profit is revenue minus cost, or {{{R(x)-C(x)=169x-119x-750=highlight_green(50x-750)}}}.



For break-even,  {{{50x-750=0}}}.


For profit of selling 500 items,  {{{50*500-750}}}.


You want to find prices for solving the last question.
{{{C(x)/x}}} is price.  This would not be constant, so possibly the question should not really be answered this way.  But continuing,  price is {{{119+750/x}}} for a "regular" price.  


HALF the regular price would be  {{{(1/2)(119+750/x)}}}.


These should mean that 200 items will be given price of  {{{119+75/20}}} per item, and that 300 items at half price will be given a price of {{{(1/2)(119+75/30)}}} per item.


None of that changes the revenue, still carrying the same formula {{{R=169x}}}.


You can continue working with the question c. if you want to.