Aarti posted a comment on her blog. Each day the number of responses to her comment was 125 percent of the number she received on the previous day. If there were 64 responses the first day, how many were there on the fourth day?

Each day’s responses are 125% of the previous day, so multiply by 1.25 each day. From the first day to the fourth day there are three increases: 64 × 1.25 × 1.25 × 1.25 = 125. The fourth day had 125 responses, which is choice B.

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