#include <bits/stdc++.h>
using namespace std;

long long modpow(long long a,long long b,long long m) {
    long long ans = 1;
    while(b) {
        if(b & 1) {
            (ans *= a) %= m;
        }
        (a *= a) %= m;
        b /= 2;
    }
    return ans;
}

int main() {
    int T;
    cin >> T;
    while (T--) {
        int A,B,C;
        cin >> A >> B >> C;
        long long a = A%B*modpow(10,C-1,B)%B;
        cout << a*10/B << endl;
    }
}