Marlye posted a story on her blog. On the first day there were 80 responses and on the second day there were 180 responses. What percent is the increase, 100, of the original number of responses, 80?

The increase was 180 − 80 = 100 responses. To find what percent 100 is of the original 80, calculate (100 ÷ 80) × 100% = 125%. So the increase is 125% of the original number of responses.

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