Repeated changes, weighted percentages and reverse compound growth

Answer: 8315​

1. Count cyclists, add the counts
2. divide by 320 and multiply by 100:8315​%.

Answer: 16

1. The final multiplier is 1−10000r2​.
2. Thus r2=256;
3. take the positive square root, 16.

Answer: 63

1. Count cyclists, add the counts
2. divide by 400 and multiply by 100:63%.