Answer :
First figure out what 5.5% of 269.99 is and then add that to the original price and you get...
269.99
• 0.055
---------
14.84945
Then round 14.85 and add 14.85 to 269.99
$284.84
269.99
• 0.055
---------
14.84945
Then round 14.85 and add 14.85 to 269.99
$284.84