#include <bits/stdc++.h>
#include <iostream>
#include <iomanip>
#include <fstream>
#include <algorithm>
#include <vector>
#include <map>
#include <unordered_map>
#include <set>
#include <queue>
#include <stack>
#include <chrono>
#include <random>
using namespace std;
#define pb push_back
#define mp make_pair
#define INF ll(1e18)
#define mod 998244353
#define mod2 1000000007
#define eps 1e-9
#define abs(x) ((x)>=0?(x):-(x))
#define y1 solai
#define fi first
#define se second
typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pll;
typedef pair<double,double> pdd;
const ll N=200100;
ll n,a,b,c;
ll bin(ll a, ll n, ll md)
{
	ll ans=1;
	while(n)
	{
		if(n&1)
			ans*=a,ans%=md;
		a*=a,a%=md;
		n/=2;
	}
	return ans%md;
}
int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);

	cin>>n;
	for(ll i=1;i<=n;i++)
	{
		cin>>a>>b>>c;
		cout<<a*bin(10,c-1,b)%b*10/b<<"\n";
	}
}
/*
5
3 2 1
1 6 7
9 2 4
123 456 789
314159265 358979323 846264338

*/