#include <bits/stdc++.h>
#define int long long
using namespace std;

int n, m, p;
double pp;

double f(double k)
{
    return (k * n + m) / (1 - pow(pp, k));
}

signed main()
{
    int T;
    cin >> T;
    while(T--)
    {
        cin >> n >> m >> p;
        pp = 1 - p / 10000.0;
        double eps = 1e-6;
        int l = 1, r = 1e9;
        double mid, lmid, rmid;
        while (r - l > 1) {
            mid = (l + r) / 2;
            lmid = mid - eps;
            rmid = mid + eps;
            if (f(lmid) < f(rmid))
                r = mid;
            else
                l = mid;
        }
        cout << fixed << setprecision(10) << f(l) << endl;
    }
}