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题目是:John deposited $10000 to open a new savings account that earned 4 percent annual interest, compounded quarterly. If there were no other transactions in the account, what was the amount of money in John's account 6 months after the account was opened? 
A. $10100 
B. $10101 
C. $10200 
D. $10201 
E  $10400 
 
答案的意思,John每个quarter收到1%的利息,因此6个月后就是¥10000(1.01)(1.01)=$10201 
 
但楼主看到compounded quarterly这句话的时候,脑子里反应的是每个quarter的利率是x的话,复利计算(1+x)的四次方=4,算出x,然后6个月拿到的钱就是$10000(1+x)的平方。 
 
照答案的意思,一年的利率就是1.01的四次方,那为什么要说是4 percent annual interst, 有点不解。。。 
 
请大家指点! 
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