Identifying Errors In Reasoning

Prepare a Presentation

Work Time

Prepare a Presentation

Prepare a presentation that shows your work for one of the problems. Create an alternate “conclusion” to replace the mistaken conclusion, and explain why your conclusion is correct.

Challenge Problem

Jack said that the percent change from $20 to $25 is 25% and the percent change from $25 to $30 is 20%. Lucy said that Jack cannot be right: because both the differences are $5, the percent change must be 25% for both sets of numbers.

Who is right? Explain why.