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posted by raul on Wednesday, August 17, 2011 at 2:07pm.
use mental math to find each value cost of 8 items at $12.98 each
At $13 each, 8 items cost $104. At $12.98 (2 cents less than $13), we just have to deduct 8*2=16 cents from $104 to get $103.84.
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