Question 1084161
Let {{{ x }}} = the regular price
For buying online:
{{{ x - .15x + 12 }}}
{{{ .85x + 12 }}}
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For what value of {{{ x }}} is
buying online cheaper?
{{{ .85x + 12 < x }}}
subtract {{{ .85x }}} from both sides
{{{ 12 < .15x }}}
{{{ 80 < x }}}
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When the regular price is greater than $80
it is cheaper to buy online
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check:
{{{ x = 80 }}}
Online price=
{{{ .85x + 12 = .85*80 + 12 }}}
{{{ .85x + 12 = 68 + 12 }}}
{{{ .85x + 12 = 80 }}}
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{{{ x = 81 }}}
{{{ .85x + 12 = .85*81 + 12 }}}
{{{ .85x + 12 = 68.85 + 12 }}}
{{{ .85x + 12 = 80.85 }}}
So, when the regular price is $81, the
online price is $80.85
OK