import java.io.*; import java.util.*; public class Main { public static void main(String[] args) throws Exception { Scanner sc = new Scanner(); int t = sc.nextInt(); StringBuilder sb = new StringBuilder(); while (t-- > 0) { long a = sc.nextInt(); long b = sc.nextInt(); long c = sc.nextInt(); long d = a * powmod(10, c - 1, b) % b * 10; sb.append(d / b).append("\n"); } System.out.print(sb); } static long powmod(long x, long p, long m) { if (p == 0) { return 1; } else if (p % 2 == 0) { return powmod(x * x % m, p / 2, m); } else { return powmod(x, p - 1, m) * x % m; } } } class Scanner { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer st = new StringTokenizer(""); public Scanner() throws Exception { } public int nextInt() throws Exception { return Integer.parseInt(next()); } public long nextLong() throws Exception { return Long.parseLong(next()); } public double nextDouble() throws Exception { return Double.parseDouble(next()); } public String next() throws Exception { while (!st.hasMoreTokens()) { st = new StringTokenizer(br.readLine()); } return st.nextToken(); } }