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Percentages SAT question
Math · Problem-Solving and Data Analysis · Medium · Answer it here, explanation included.
Which of the following represents the result of increasing the quantity x by 9%, where 
?
ExplanationShow
Choice A is correct. Increasing the positive quantity x by 9% is the result of adding 9% of x to x. 9% of x can be represented algebraically as 
, or 
. Adding this expression to x yields 
, or 
.
Choice B is incorrect. This represents 9% of x. Choice C is incorrect. This represents increasing x by 9, not by 9%. Choice D is incorrect. This represents increasing x by 0.09, not by 9%.
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