Question 926609
if costs reached ${{{c=800000}}}

{{{800000=900x + 80000}}}

{{{800000-80000=900x }}}

{{{720000=900x }}}

{{{7200cross(0)cross(0)=9cross(0)cross(0)x }}}

{{{7200=9x }}}

{{{7200/9=x }}}

{{{800=x }}}  items were produced if costs reached ${{{800000}}}