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				 Do the tax laws change daily? 
 Because I'm cheap, I've been taking advantage of Subway's $5 footlong of the day specials. In the morning, I get a breakfast sandwich (the exact same one every day) which costs $3.95 and a $5 footlong for later. The footlong sandwich changes every day, but it's always five bucks. I always go to the same store.
 After a while, I realized I wasn't paying the same amount every day, so I started keeping my receipts. For the last three days, my totals have been:
 Tue: $9.29
 Wed: $9.71
 Thr: $9.31
 
 The sandwiches always total $8.95. It's the tax that varies.
 
 I always get them to go. I always get the breakfast sandwich heated and the footlong cold. For the life of me, I can't understand what's going on. I plan on bringing the receipts to the manager, but I wonder if anyone here can shed some light on this.
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