#include<bits/stdc++.h>
using namespace std;
#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;
    }
    cout<<f(l)<<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;
}