#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()
double n,m;
double p;
const double eps=1e-9;
double f(double x){
    return (n*x+m)*1.0/(1.0-pow(1.0-p,x));
}
void solve(){
    cin>>n>>m>>p;
    p*=1e-4;
    double l=1.0,r=1e18;
    while(r-l>eps){
        double m1=l+(r-l)/3;
        double m2=l+(r-l)/3*2;
        if(f(m1)>f(m2))l=m1;
        else r=m2;
    }

   printf("%.14lf\n",f(r));

}
signed main(){
    //ios::sync_with_stdio(false);
    //cin.tie(nullptr),cin.tie(nullptr);
    int T=1;
    cin>>T;
    while(T--)solve();
    return 0;
}