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

int T;
int n, m;
double p;

double f(double x)
{
    return (n * x + m) / (1 - pow(1 - p / 10000.0, x));
}

int main()
{
    cin >> T;
    while (T--)
    {
        cin >> n >> m >> p;
        double l = 0, r = 1e9 + 5;
        while (fabs(r - l) >= 1e-6)
        {
            double l2 = (r - l) * 1.0 / 3.0 + l;
            double r2 = (r - l) * 2.0 / 3.0 + l;
            if (f(l2) >= f(r2))
                l = l2;
            else
                r = r2;
        }
        double ans = min(f((int)l), f((int)(l + 1)));
        printf("%.6lf\n", ans);
    }
    return 0;
}