[SWEA] 6692번 다솔이의 월급상자

import java.util.Scanner;

public class Solution {
    
    public static void main(String[] args){
    	
    	Scanner kb = new Scanner(System.in);
    	int T = kb.nextInt();
    	
    	for(int i=1; i<=T; i++) {
    		int N = kb.nextInt();
    		double answer = 0;
    		
    		for(int j=0; j<N; j++) {
    			double p = kb.nextDouble();
    			double x = kb.nextDouble();
    			answer += p*x;
    		}

    		System.out.println("#" + i + " " + String.format("%.6f", answer));
    	}

    }
}