#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll n,m;
int p;
const long double esp = 1e-5;
void solve(){
    cin>>n>>m>>p;
    long double q = 1.0-(p/10000.0);
    long double t = q;
    long double ans = 1.0*(n+m)/(1-q);
    for(int i=2;i<=100000;i++){
        q*=t;
        ans=min(ans,1.0*(n*i+m)/(1-q));        
        if(q<esp) break;
    }
    cout<<ans<<endl;
}
signed main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cout<<fixed<<setprecision(10);
    int T;
    cin >> T;
    while(T--) solve();
    return 0;
}