#include <bits/stdc++.h>
    using namespace std;
    #include <math.h>
    #include <iomanip>
    #include <cstdint>
    #include <string>
    #include <sstream>
    
    template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
    template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
    #define rep(i,n) for (int i = 0; i < (n); ++i)

    typedef long long ll;
    typedef unsigned long long ull;
    using P=pair<ll,ll>;
    const int INF=1001001001;
    const ll INFL=1e18;
    const int mod=1e9+7;
    
    ll mod_pow(ll x,ll n,ll m){
        if(n==0)return 1;
        ll tmp=mod_pow(x%m*x%m,n/2,m);
        if(n&1){tmp=tmp*x%m;}
        return tmp;
    }
    void solve(){
        ll a,b,c;
        cin>>a>>b>>c;
        ll cc=mod_pow(10,c-1,b);
        cc=cc*a%b*10;
        cc/=b;
        cout<<cc<<endl;
    }  

    int main(){
        ios_base::sync_with_stdio(false);
        cin.tie(NULL);
        
        int t;
        cin>>t;
        rep(i,t){
            solve();  
        }

        return 0;
    }