{"trustable":false,"sections":[{"title":"题目描述","value":{"format":"HTML","content":"某专家指出,从洛阳师范毕业的很多学生,后来都成了高富帅(especially ACM TEAM ^ ^),让我们算一算他们每个月的平均月薪是多少。"}},{"title":"输入","value":{"format":"HTML","content":"输入有12行,代表12个月的薪水。"}},{"title":"输出","value":{"format":"HTML","content":"输出一行,代表这一年的平均月薪。首先输出一个$,再输出每个月的平均金额。结果保留两位小数。"}},{"title":"提示","value":{"format":"HTML","content":"输出使用printf(\"%.2f\\n\",x); "}},{"title":"样例","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e100.00\n489.12\n12454.12\n1234.10\n823.05\n109.20\n5.27\n1542.25\n839.18\n83.99\n1295.01\n1.75\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e$1581.42\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}}]}