SOLUTION: The sales tax is $18 on a diamond ring that sells for $600. What is the sales tax rate? I am having a difficult time with how to set up this problem.

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Question 300334: The sales tax is $18 on a diamond ring that sells for $600. What is the sales tax rate? I am having a difficult time with how to set up this problem.
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
sales tax rate = STR
600*STR = 18
STR = 18/600