#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define re read()
#define INF 9223372036854775800
#define fr(i, x, y) for (int i = x, p = y; i <= p; ++i)
#define rp(i, x, y) for (int i = x, p = y; i >= p; --i)
#define Timeok ((double)clock() / CLOCKS_PER_SEC < MAX_TIME)
const double MAX_TIME = 1.0 - 0.0032;

inline ll read()
{
    ll x = 0, f = 0;
    char ch = getchar();
    while (!isdigit(ch))
        f |= (ch == '-'), ch = getchar();
    while (isdigit(ch))
        x = (x << 1) + (x << 3) + (ch ^= 48), ch = getchar();
    return f ? -x : x;
}

void write(ll x)
{
    if (x < 0)
        putchar('-'), x = -x;
    if (x > 9)
        write(x / 10);
    putchar(x % 10 + 48);
}

inline void W(ll x, char ch)
{
    write(x);
    putchar(ch);
}

/*------------C-O-D-E------------*/
int main()
{
    ll T = re;
    while (T--)
    {
        long double n, m, p;
        cin >> n >> m >> p;
        p /= 10000;
        long double mi = 1e9;
        for (int i = 1; i <= 10000; i++)
        {
            long double ii = 1.0 * i;
            long double d = (n * ii + m) / (1.0 - pow(1 - p, i));
            // if(d > mi) break;
            mi = min(mi, d);
        }
        printf("%.10Lf\n", mi);
    }
    return 0;
}