Answer:
18%
Step-by-step explanation:
To calculate percentage improvement use
percentage improvement = [tex]\frac{improvement}{original}[/tex] × 100%
Change time to seconds
3 minutes 20 sec = (3 × 60) + 20 = 200 seconds
2 minutes 44 seconds = (2 × 60) + 44 = 164 seconds
improvement time = 200 - 164 = 36 seconds, hence
percentage improvement = [tex]\frac{36}{200}[/tex] × 100% = 18%
