Answer :
14laps x 400yards = 5600
Then do
1680/5600= 0.3
And convert that to a perfect by multiplying it by 100
0.3 x 100 = 30% of the run Xian has completed
Then do
1680/5600= 0.3
And convert that to a perfect by multiplying it by 100
0.3 x 100 = 30% of the run Xian has completed