#include<bits/stdc++.h>
using namespace std;
#define double long double
#define int long long
#define pii pair<int,int>
#define fi first
#define se second
#define all(_a) _a.begin(),_a.end()
const double eps=1e-9;
double n,m;
double p;
double f(int x){
return ((n*x+m)*1.0)/(1.0-pow(1.0-p,x));
}
void solve(){
cin>>n>>m>>p;
p*=0.0001;
double l=0.0,r=1e9;
while(r-l>eps){
double m1=l+(r-l)/3;
double m2=r-(r-l)/3;
if(f(m1)>f(m2)) l=m1;
else r=m2;
}
double t=min((f(l),f(l+1));
cout<<t<<endl;
}
signed main(){
ios::sync_with_stdio(false);
cin.tie(nullptr),cin.tie(nullptr);
cout << setiosflags(ios::fixed) << setprecision(15);
int T=1;
cin>>T;
while(T--)solve();
return 0;
}