import java.util.*;
import java.io.*;

public class Main {
    
    public static Scanner sc = new Scanner(System.in);
    public static PrintWriter pw = new PrintWriter(System.out);
    
    public static void main(String[] args) {
        
        int t = sc.nextInt();
        while( t > 0 ) {
            solve();
            t--;
        }
        
        pw.flush();
        
    }
    
    static void solve() {
        
        long A = sc.nextInt();
        long B = sc.nextInt();
        long C = sc.nextInt();
        A %= B;
        A *= modpow(10,C-1,B);
        A %= B;
        A *= 10;
        pw.println(A/B);
        
    }
    
    static long modpow( long x, long n, long mod ) {
		
		if( n == 0 ) {
			return 1;
		}
		
		long k = 1;
		while( n > 1 ) {
			if( n%2 == 1 ) k *= x;
			x *= x;
			n /= 2;
			x %= mod;
			k %= mod;
		}
		
		return (k*x)%mod;
		
	}
    
}