Question 620114
The charge, {{{C}}}, for 36 canoes increased 
by {{{ x }}} $.50 price hikes, and losing 2 rentals
per price hike is:
{{{ C = ( 36 - 2x )*(12 + .5x) }}}
{{{ C = 432 - 24x + 18x - x^2 }}}
{{{ C = -x^2 - 6x + 432 }}} answer
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check: If you have {{{8}}} $.50 price increases,
The charge is
{{{ C = -x^2 - 6x + 432 }}}
{{{ C = -8^2 - 6*8 + 432 }}}
{{{ C = -64 - 48 + 432 }}}
{{{ C = 432 - 112 }}}
{{{ C = 320 }}}
and
{{{ C = ( 36 - 2*8 )*(12 + .5*8) }}}
{{{ C = 20*16 }}}
{{{ 320 }}}
OK