SAT Math Multiple Choice Practice Question 207: Answer and Explanation
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Question: 207
9. Note: The following chart represents the money that Sita has in her bank accounts during the years 2008, 2009, and 2010.
If Sita's money in her retirement account in 2008 represents 0.1% of the bank's money, how much money is in the bank?
A. $400
B. $4,000
C. $40,000
D. $400,000
E. $4,000,000
Correct Answer: D
Explanation:
D. To solve this, first determine how much money Sita has in her retirement account in 2008. She has $400. If $400 represents 0.1% of the bank's money, you can set up a proportion with x as the total money in the bank: 
. Cross-multiplying yields 40,000 = 0.1x, so x = $400,000.