Question 1065228
Let {{{ p }}} = the price of the groceries
without the tax
{{{ .06p }}} = the tax on the groceries
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{{{ p + .06p = 168.84 }}}
{{{ 1.06p = 168.84 }}}
{{{ p = 159.28 }}}
{{{ .06*159.28 = 9.56 }}}
The sales tax was $9.56 
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check:
{{{ 168.84 - 9.56 = 159.28 }}}
{{{ .06*159.28 = 9.56 }}}
OK