A cyclist's breathing rate was measured during a high-intensity spinning class. The graph below shows the data collected over 15 minutes, with the active exercise period ending at 12 minutes, followed by a 3-minute recovery period.
Calculate the percentage increase in the cyclist's breathing rate from 0 minutes to 12 minutes.
Use the equation:
Percentage increase=Breathing rate at 12 minutes−Breathing rate at 0 minutesBreathing rate at 0 minutes×100\text{Percentage increase} = \frac{\text{Breathing rate at 12 minutes} - \text{Breathing rate at 0 minutes}}{\text{Breathing rate at 0 minutes}} \times 100Percentage increase=Breathing rate at 0 minutesBreathing rate at 12 minutes−Breathing rate at 0 minutes×100