Question 1133731


 let price before tax be {{{p}}}
{{{10}}}% off {{{p}}}:{{{0.10p}}}

{{{p-0.10p=217.95}}}
{{{0.90p=217.95}}}
{{{p=217.95/0.90}}}
{{{p=242.1666666666667}}}
{{{p=242.17}}}->she would have paid without the coupon