#include<bits/stdc++.h>
using namespace std;
#define int long long
typedef pair<int, int> PII;
const double eps = 1e-6;
int m, n;
double p;
double check(double x)
{
	return (x * n + m) / ((1 - pow(1 - p * 1e-4, x)));
}
void solve() 
{
	std:: cin >> m >> n >> p;
	double l = 1, r = 1e6;
	while((r - l) > eps)
	{
		double mid = (l + r) / 2;
		if(check(mid - eps) < check(mid + eps))
		{
			r = mid;
		}
		else
		{
			l = mid;
		}
	}
	std:: cout << fixed << setprecision(10) << min(check(ceil(l)), check(floor(l))) << endl;
}

signed main()
{
	ios::sync_with_stdio(false);
	cin.tie(0), cout.tie(0);
    int T;
    std:: cin >> T;
    while(T -- )
	solve();
	return 0;
}