The account carries interest of 4%.
该存款有4%的利息。
The interest is added to your account every year.
每年的利息都加到你的存款中。
The interest rate for the savings account is 4%.
储蓄存款的利率是4%。
It varies from time to time. At present it is 6%.
（年息）每个时期都不同，现在是六厘。
interest rate 利率
simple interest 单利
compound interest 复利
legal interest 法定利息
prime rate 优待利率
payable interest 应付利息
lending rate 贷款利率
usury 高利贷
the subsidy rate for value-preserved savings 保值储蓄补贴率