题目信息
The annual stockholders' report for Corporation X stated that profits were up 10 percent over the previous year, although profits as a percent of sales were down 10 percent. Total sales for that year were approximately what percent of sales for the previous year?
A:78%
B:90%
C:110%
D:122%
E:190%
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正确答案：
D:122%
Algebra Percents
Let P1 and S1 be the profit and sales for the previous year, and let P2 and S2 be the profit and sales for the following year. It is given that P2 = 1.1P1 and
. Substituting the first equation into the second equation gives 
, or 
. Therefore, S2 is approximately 122% of S1.
The correct answer is D.
Let P1 and S1 be the profit and sales for the previous year, and let P2 and S2 be the profit and sales for the following year. It is given that P2 = 1.1P1 and
. Substituting the first equation into the second equation gives , or . Therefore, S2 is approximately 122% of S1.The correct answer is D.
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