Question 1128522
Let {{{ x }}} = the number of kits sold
Let {{{ P(x) }}} = the monthly profit
----------------------------------------
{{{ P(x) = 160x - 120x - 18000 }}}
{{{ P(x) = 40x - 18000 }}}
-------------------------------
The break even point is where cost = income
{{{ 160x = 120x + 18000 }}}
{{{ 40x = 18000 }}}
{{{ x = 450 }}}
and
{{{ 160x = 160*450 }}}
{{{ 160x = 72000 }}}
---------------------------
The beak even level is ( 450, 72000 ) where
450 kits are made at a total cost of 72,000
---------------------------
check the math