#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
#define rep(i, n) for(ll i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()
template<class T>bool chmin(T&a, const T&b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool chmax(T&a, const T&b){if(a<b){a=b;return 1;}return 0;}
ll mpow(ll x, ll y, ll MOD){
    ll res = 1; x %= MOD;
    while(y){
        if(y%2) res = res * x % MOD;
        x = x * x % MOD;
        y /= 2;
    }
    return res;
}
int main(){
    int t;
    cin >> t;
    rep(houren,t){
        ll a,b,c;
        cin >> a >> b >> c;
        cout << a * mpow(10, c-1, b) % b * 10 / b << endl;
    }
    return 0;
}