#include <bits/stdc++.h>
using namespace std;
#define int long long
#define double long double
typedef pair<int, int> pii;

const int N = 1e5 + 10, mod = 1e9 + 7;
int dx[] = {0, 0, 1, -1};
int dy[] = {1, -1, 0, 0};

void solve()
{
    double n, m, p;
    cin >> n >> m >> p;
    p *= 1e-4;
    auto check = [&](int x) -> double
    {
        return (1.0 * x * n + m) / (1.0 - pow(1.0 - p, x));
    };
    int l = 1, r = 1e18;
    while (l < r)
    {
        int ll = l + (r - l) / 3;
        int rr = r - (r - l) / 3;
        if (check(rr) >= check(ll))
        {
            r = rr - 1;
        }
        else
            l = ll + 1;
    }
    cout << setiosflags(ios::fixed) << setprecision(15) << check(l) << "\n";
}

signed main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int t = 1;
    cin >> t;
    while (t--)
        solve();
    return 0;
}