从一副52张的扑克牌中任抽一张，得到Q的概率为（ ）。
阅读对话，完成句子。
John: Hello.
Bill: Hello. It's Uncle Bill. Is everybody at home?
John: Yes.
Bill: What are they doing?
John: Grandma is writing. Dad is writing an e-mail. Mom is washing the clothes. And I am sweeping the floor.
1. _______________ is _________________________.
2. _______________ is _________________________.
计算题：某工程投资25000万元，经济寿命10年，每年收益3000万元，残值7000万元，ic=5%，项目的IRR是多少？此工程是否可行？
_______________ is _________________________.
_______________ is _________________________.