Question 1129470

{{{P(x)=50x-50000 }}}-> note: {{{x}}} represents the number of computer briefcases 

to find {{{ P(4000)}}}, which means {{{x=4000}}}, and all you need is to go to given equation {{{P(x)=50x-50000 }}} and plug in {{{x=4000}}}

{{{P(4000)=50*4000-50000 }}}

{{{P(4000)=200000-50000 }}}

{{{P(4000)=150000 }}}