#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
//const long nPrime = 1000000007;
//const long nPrime = 998244353;
typedef long long ll;
long LF_Pow(long nBase, long nExp, long nMod){
    if(nExp < 0){
        return -1;
    }
    long iTmp = nBase % nMod;
    long nReturn = 1;
    while (nExp > 0){
        if(nExp % 2 == 1){
            nReturn *= iTmp;
            nReturn %= nMod;
        }
        iTmp = iTmp * iTmp;  
        iTmp %= nMod;
        nExp /= 2;
    }
    return nReturn;    
}
int main() {
    long t;
    cin >> t;
    while(t--){
        long a,b,c;
        cin >> a >> b >> c;
        long x = LF_Pow(10, c-1,b);
        x *= a;
        x %= b;
        x *= 10;
        cout << x/b << endl;
    }
    return 0;
}