백준 #26575번 Pups

import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		int n = sc.nextInt();
		
		for(int i = 0; i < n; i++) {
            double d = sc.nextDouble();
			double f = sc.nextDouble();
			double p = sc.nextDouble();
			
			System.out.println("$" + String.format("%.2f", d * f * p));
		}
		sc.close();
	}
}