#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
int main(){
int t;
cin>>t;
while(t--){
double a,b,s;
cin>>a>>b>>s;
if(s==0)
cout<<"100.000000%"<<endl;
else if(a*b<=s)
cout<<"0.000000%"<<endl;
else{
double area=s*log(a*b/s)+s;
cout<<fixed<<setprecision(6)<<round(1e8*(1-area/(a*b)))/1e6<<'%'<<endl;
}
}
}
#include <cmath>
#include <iomanip>
using namespace std;
int main(){
int t;
cin>>t;
while(t--){
double a,b,s;
cin>>a>>b>>s;
if(s==0)
cout<<"100.000000%"<<endl;
else if(a*b<=s)
cout<<"0.000000%"<<endl;
else{
double area=s*log(a*b/s)+s;
cout<<fixed<<setprecision(6)<<round(1e8*(1-area/(a*b)))/1e6<<'%'<<endl;
}
}
}
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