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.

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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.