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An e-commerce platform found a product had 500 sales in January 2021 and 20% month-over-month growth in February. How many were sold in February?
A. 600
B. 400
C. 1100
D. 550
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According to the formula for month-on-month calculation: (Current month value - Previous month value)/Previous month value * 100%, plugging in the formula (600-500)/500*100%=20%, the calculated sales volume for February is 600.

我们可以通过计算来确定答案。已知该产品在2021年1月售出500件,2月的月环比增长率为20%。

首先,我们计算2月的销售量:
\[ \text{2月销售量} = \text{1月销售量} + \text{1月销售量} \times \text{增长率} \]
\[ \text{2月销售量} = 500 + 500 \times 0.20 \]
\[ \text{2月销售量} = 500 + 100 \]
\[ \text{2月销售量} = 600 \]

因此,正确答案是:
A: 600

根据计算,2月份售出了600件产品。