flea market booth

Clifford Shropshire has a flea market booth and marks all his items so that the price includes state sales tax at a rate of 6.5%. He sold a set of china for $285. How much sales tax should he send to the state?
2. You have agreed to pay $850 for a used utility trailer. The price includes sales tax at a rate of 7.75%. What was the marked price of the trailer and how much tax was paid

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