Total Charge
Canada Tango Plus 10 credits - 10 credits 5,156.00
Taxes
Canada Goods and Services Tax (GST/HST #100092287 RT0001) 258.00
Other Taxes 387.00
Total Taxes 644.00
Grand Total - US Dollars $5,800.01

5% of 5156 is $257.80, not $258

$258 + $387 = $645, not $644

Whole dollar amounts added together should not result in a .01

Now, the flight pass is advertised as $5800, so I don't really care, but where the heck are these numbers coming from?