Question 1053360
At breakeven, {{{C(x)=R(x)}}},
{{{0.3x+140=0.5x}}}
{{{0.2x=140}}}
{{{x=700}}}
The profit function is,
{{{P(x)=R(x)-C(x)}}}
{{{P(x)=0.5x-(0.3x+140)}}}
{{{P(x)=0.2x-140}}}
So at {{{x=700}}}
{{{P(700)=0.2(700)-140}}}
{{{P(700)=140-140}}}
{{{P(700)=0}}}
By definition, at breakeven {{{C(x)=R(x)}}} so {{{P(x)=0}}}
So for {{{x>700}}}, you will make profit.
None of those answers is correct.