A bus route records 45 delays one month and 58 the next. What is the percent increase? Enter the number of percent, rounded to the nearest whole number.

Explanation

The increase is 58 - 45 = 13, and 13 / 45 x 100 = 28.89%, which rounds to 29%. Dividing by 58 gives 22.41% and fails because the later count is not the base.