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  3. ANNUAL PERCENT CHANGE IN DOLLAR AMOUNT OF SALES AT FIVE RETAIL STORES FROM 2006 TO 2008 If the dollar amou

ANNUAL PERCENT CHANGE IN DOLLAR AMOUNT OF SALES AT FIVE RETAIL STORES FROM 2006 TO 2008 If the dollar amou

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问题             ANNUAL PERCENT CHANGE IN DOLLAR AMOUNT OF SALES
                    AT FIVE RETAIL STORES FROM 2006 TO 2008

If the dollar amount of sales at Store P was $800,000 for 2006, what was the dollar amount of sales at that store for 2008?
选项 A、$727,200
B、$792,000
C、$800,000
D、$880,000
E、$968,000
答案B
解析 According to Figure 8, if the dollar amount of sales at Store P was $800,000 for 2006, then it was 10 percent greater for 2007, which is 110 percent of that amount, or $880,000. For 2008 the amount was 90 percent of $880,000, which is $792,000.
The correct answer is Choice B, $792,000.
Note that an increase of 10 percent for one year and a decrease of 10 percent for the following year does not result in the same dollar amount as the original dollar amount because the base that is used in computing the percents is $800,000 for the first change but $880,000 for the second change.
This explanation uses the following strategies.
Strategy 4: Translate from a Figure to an Arithmetic or Algebraic Representation
Strategy 5: Simplify an Arithmetic or Algebraic Representation
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