In a citywide survey, two out of every 10 residents reported using the public library regularly last year. This year, the survey indicated that out of 1,000 residents surveyed, 250 reported using the public library regularly. Before you report these findings as a percentage change in library usage, what steps do you have to take? Question 5 options: Convert this year's number to a base of 10, to match last year's figure, before calculating the percentage change. Report the change as a 22.5 per cent increase without any conversion, since the raw numbers show an increase from 200 to 250 regular users. Convert last year's data to a figure out of 1,000 to match this year's survey base before calculating the percentage change. Calculate the percentage from last year's data and compare it directly to this year's 25 per cent without conversion.