// MagicDark
#include <bits/stdc++.h>
#define int long long
#define double long double
#define debug cerr << "\33[32m[" << __LINE__ << "]\33[m "
#define SZ(x) ((int) x.size() - 1)
#define all(x) x.begin(), x.end()
#define ms(x, y) memset(x, y, sizeof x)
#define F(i, x, y) for (int i = (x); i <= (y); i++)
#define DF(i, x, y) for (int i = (x); i >= (y); i--)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
template <typename T> T& chkmax(T &x, T y) {return x = max(x, y);}
template <typename T> T& chkmin(T &x, T y) {return x = min(x, y);}
template <typename T> T& read(T &x) {
	x = 0; int f = 1; char c = getchar();
	for (; !isdigit(c); c = getchar()) if (c == '-') f = - f;
	for (; isdigit(c); c = getchar()) x = (x << 1) + (x << 3) + (c ^ 48);
	return x *= f;
}
int n, m, w;
double p;
double power(double x, int y) {
	double ans = 1;
	for (; y; x = x * x, y >>= 1)
		if (y & 1) ans = ans * x;
	return ans;
}
double calc(int x) {
	// debug << power(1 - p, x) << endl;
	return (x * n + m) / (1 - power(1 - p, x));
}
void zhk() {
	cin >> n >> m >> w;
	p = (double) w / 10000;
	int l = 0, r = 115125 + 10;
	while (l + 1 < r) {
		int mid = (l + r) >> 1;
		// debug << l << ' ' << r << ' ' << calc(mid) << endl;
		if (calc(mid) < calc(mid + 1)) r = mid;
		else l = mid;
	}
	// debug << r << endl;
	cout << fixed << setprecision(10) << calc(r) << '\n';
}
signed main() {
	ios::sync_with_stdio(0); // don't use puts
	cin.tie(0), cout.tie(0);
	int _ = 1;
	cin >> _;
	while (_--) zhk();
	return 0;
}
/* why?
*/