I,R=input,range
L=11**5
P=[]
C=[0]*L
p=[0]*L
c=0
for i in R(2,L):
	if C[i]<1:
		P+=[i]
		c,j=c+1,i*2
		while j<L:C[j],j=1,j+i
	p[i]=c
for t in R(int(I())):
	N,A,B=map(int,I().split())
	print(A*p[N]/(A*p[N]+(100-B)*(N-p[N])))