Solve the problem.When you buy an item on which sales tax is charged, the total cost is calculated by the formula: 
where T is the total cost, P is the item's price, and S is the sales tax rate (as a percent). If you pay $20.9 for an item priced at $20, what was the tax rate?
A. 2.25%
B. 4.5%
C. 5.5%
D. 6.5%
Answer: B
Mathematics
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A. 
= 
B. 
= 
C. 
= 
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= 
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A. 
B. - 
C. - 
D. 
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A. 
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