/* -*- coding: utf-8 -*-
 *
 * 1842.cc:  No.1842 Decimal Point - yukicoder
 */

#include<cstdio>
#include<algorithm>
 
using namespace std;

/* constant */

/* typedef */

typedef long long ll;

/* global variables */

/* subroutines */

int powmod(int a, int n, int mod) {  // a^n % MOD
  int pm = 1;
  while (n > 0) {
    if (n & 1) pm = (ll)pm * a % mod;
    a = (ll)a * a % mod;
    n >>= 1;
  }
  return pm;
}

/* main */

int main() {
  int tn;
  scanf("%d", &tn);

  while (tn--) {
    int a, b, c;
    scanf("%d%d%d", &a, &b, &c);

    int d = (ll)(a % b) * powmod(10, c - 1, b) % b;
    int e = (ll)d * 10 / b;
    printf("%d\n", e);
  }
  return 0;
}