Question 1029329
The 15% discount made the purchase price  {{{0.85x}}} dollars.  The tax may be in addition to the purchase price, so if the 5% tax is based on the LISTED price, then  purchase price PLUS the tax becomes  {{{0.85x+0.05x}}}.


Fully, what he paid was  {{{0.85x+0.05x=0.90x}}}.


Ron sold the computer for y dollars.
{{{y=0.55(whatHeFullyPaid)}}}
{{{y=0.55*0.9x}}}
{{{highlight(y=0.495x)}}}


Read through the description one phrase at a time, watching the numbers and any variables, and build-up the expressions and equations, and connect any identified relationships.


This question is a little ambiguous to me, so I ASSUMED the tax is based on the listed price, and not on the price of AFTER DISCOUNT.