#include<bits/stdc++.h>
#define endl '\n'
#define int long long
#define pii pair<int, int>
#define IOS ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);  
#define rep(x,a,b) for(int x=a;x<=b;x++)
#define pre(x,a,b) for(int x=a;x>=b;x--)
using namespace std;
const int N = 1e6 + 10;
double n, m, p;
double qmi(double x, int b)
{
	double base = 1;
	while(b)
	{
		if(b & 1) base = base * x;
		b >>= 1;
		x = x * x;
	}
	return base;
}
double check(int x)
{
    return (n * x + m) / (1 - qmi(1 - p, x));
}
void solve()
{   
    cin >> n >> m >> p;
    p = p * 0.0001;
    int l = 1, r = 1e9;
	while(l <= r)
	{
		double ml = l + (r - l) / 3, mr = r - (r - l) / 3;
		if(check(ml) <= check(mr)) r = mr - 1;
		else l = ml + 1;
	}
    printf("%.7lf\n", min(check(l), check(r)));
}
signed main()
{
    IOS;
	int _;
	_ = 1;
	cin >> _;
	while(_--)
	{
	    solve();
	}
	return 0;
}