The table shows the minutes of reading logged by four students.
Student | Week 1 | Week 2 Ana | 120 | 170 Ben | 90 | 135 Cara | 140 | 126 Dev | 100 | 100
Which student had the greatest PERCENT increase in reading time from Week 1 to Week 2?
Show answer & explanation
Answer: B
Ana: Ana had the largest increase in minutes (50), but 50 ÷ 120 is only about 42%.
Ben: Correct. Ben increased by 45 minutes, and 45 ÷ 90 = 50%, the largest percent increase.
Cara: Cara's reading time decreased by 14 minutes (a 10% decrease).
Dev: Dev's reading time did not change, a 0% increase.
Percent increase compares the change with the starting amount; the largest change in minutes is not always the largest percent change.