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{30 POINTS} For a promotion, a store offers to pay the sales taxes on any item
you buy. You are actually paying taxes but they are calculated on
a lower price.
Suppose you buy an item for $100.
The sales taxes are 15%.
a) What is the true sale price of the item?
b) How much tax are you really paying?

The answers book states '12. a) $86.96 b) $13.04', but I need steps on how