#include <bits/stdc++.h>
using namespace std;
#define int long long
constexpr int mod = 1000000007;
inline int qpow(int x, int y, int z){int ret = 1; for (; y; y /= 2, x = x * x % z) if (y & 1) ret = ret * x % z; return ret;}
signed main()
{
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  int T; cin >> T;
  while (T --)
  {
    int A, B, C; cin >> A >> B >> C;
    cout << (qpow(10, C - 1, B) * A % B * 10) / B << "\n";
  }
  return 0;
}