1. **State the problem:** We need to find the Creperie's productivity in crepes per minute before and after changes, and then calculate the percentage improvement. 2. **Formula for productivity:** Productivity in crepes per minute is given by $$\text{Productivity} = \frac{\text{crepes per hour}}{60}$$ because there are 60 minutes in an hour. 3. **Calculate productivity before changes:** $$\text{Productivity before} = \frac{33}{60} = 0.55$$ crepes per minute. 4. **Calculate productivity after changes:** $$\text{Productivity after} = \frac{51}{60} = 0.85$$ crepes per minute. 5. **Calculate percentage improvement:** The percentage improvement is given by $$\text{Percentage improvement} = \frac{\text{Productivity after} - \text{Productivity before}}{\text{Productivity before}} \times 100$$ Substitute values: $$= \frac{0.85 - 0.55}{0.55} \times 100 = \frac{0.30}{0.55} \times 100 \approx 54.55\%$$ **Final answers:** - Productivity before changes: 0.55 crepes per minute - Productivity after changes: 0.85 crepes per minute - Percentage improvement: 54.55%