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

const int N = 1e6 + 5;

long double cal(int x, int n, int m, int p) {
    return 1.0 * (x * n + m) / (1 - pow((long double)(1 - p * 1e-4), x));
}

void solve() {
    int n, m, p;
    cin >> n >> m >> p;
    long double ans = 1e30;
    int l = 1, r = INT_MAX;
    while (l <= r) {
        int lmid = l + (r - l) / 3;
        int rmid = r - (r - l) / 3;
        long double lans = cal(lmid, n, m, p);
        long double rans = cal(rmid, n, m, p);
        if (lans < rans) {
            ans = lans;
            r = rmid - 1;
        }
        else {
            ans = rans;
            l = lmid + 1;
        }
    }
    cout << fixed << setprecision(20) << ans << endl;
}

signed main() {
    ios::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);

    int T = 1;
    cin >> T;
    while (T--) solve();

    return 0;
}