if the diameter of circle r is 40 % of the diameter of circle s , the area of circle r is what percent of the area of circle s ?
import math
n0 = 40.0
t0 = math.pi * n0**2
t1 = math.pi * 100.0**2
t2 = t0 * 100.0
answer = t2 / t1
print(answer)