Tutor

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Tutor

Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65535/65535 K (Java/Others)
Total Submission(s): 4265 Accepted Submission(s): 1118

Problem Description

Lilin was a student of Tonghua Normal University. She is studying at University of Chicago now. Besides studying, she worked as a tutor teaching Chinese to Americans. So, she can earn some money per month. At the end of the year, Lilin wants to know his average monthly money to decide whether continue or not. But she is not good at calculation, so she ask for your help. Please write a program to help Lilin to calculate the average money her earned per month.

Lilin 是通化师范学院的学生。 她正在芝加哥大学学习。 除了学习，她还做家教，教美国人学习中文。 因此每月她可以挣一些钱。 在今年年底，Lilin想知道他的平均每月的钱来决定是否继续下去。但是她不擅长计算，所以她请求你的帮助。请写一个程序来帮助Lilin计算她每月的平均收入。

Input

The first line contain one integer T, means the total number of cases.
Every case will be twelve lines. Each line will contain the money she earned per month. Each number will be positive and displayed to the penny. No dollar sign will be included.

第一行包含一个整数T，表示所有情况的总数。 每一种情况都是十二行。每条线都包含她每个月赚的钱。每一个数都是正数，并显示为美元。不包括任何美元符号。

Output

The output will be a single number, the average of money she earned for the twelve months. It will be rounded to the nearest penny, preceded immediately by a dollar sign without tail zero. There will be no other spaces or characters in the output.

输出将是一个数字，即她在12个月里赚的钱的平均值。它将被四舍五入到最接近的美元，在四舍五入之前它是一个没有尾数0的美元符号。输出中没有其他空格或字符。

Sample Input

2 
100.00 
489.12 
12454.12 
1234.10 
823.05 
109.20 
5.27 
1542.25 
839.18 
83.99 
1295.01 
1.75
100.00 
100.00 
100.00 
100.00 
100.00 
100.00 
100.00 
100.00 
100.00 
100.00 
100.00 
100.00

Sample Output

$1581.42 
$100

Source

2013 ACM-ICPC吉林通化全国邀请赛——题目重现