男性，25岁。被人用刀刺伤左前胸部1小时急诊入院。体检：血压：80/50mmHg，颈静脉怒张，脉搏细弱，心音遥远。

首先要考虑的诊断是（）

A.张力性气胸

B.闭合性气胸

C.血气胸

D.心脏损伤

E.急性心脏压塞

A family made a down payment of $75 and borrowed the balance on a set of encyclopedias that cost $400. The balance with interest was paid in 23 monthly payments of $16 each and a final payment of $9.
The amount of interest paid was what percent of the amount borrowed ？（）

A．6%

B．12%

C．14%

D．16%

E．20%