某写字楼持有5年后出售，持有期内年均有效毛收入为400万元，运营费用率为30％，预计5年后出售时总价为6000万元，销售税费为售价的6％，无风险报酬率为6％，风险报酬率为无风险报酬率的25％。该写字楼目前的价格为（）万元。

A.5061.44

B.5546.94

C.5562.96

D.6772.85

My secret of staying young is simple: keeping your mind awake and you will stay young all over. Take an interest in world around you, and learn at least one old thing every day. Don’t think that you are ever very old to go back to school. I know a man who entered medical college in 70. He got his degree with honors and became a famous doctor. Other man went to law school at 71 and is now a active lawyer. You may say that staying young is easy only for those live in the future. In fact, you can do it whether you care enough to try to keep your mind awake and active, and which is the only way to be always young.