Xian plans to run 20 laps around a track. each lap is 400 yards. so far xian has to run 1680 yards around the track. what percentage of the run has xian completed.

Marion has a bicycle that she is planning to take for a ride. the rim of the rear wheel lies 41 cm from the center of the wheel. the tire itself has a thickness of 3 cm. in order for marion to ride her bicycle 96,712 cm approximately how many rotations will the rear wheel make?