Word: 利息 (lìxī)

利息不高，但本金很安全。

Lìxī bù gāo, dàn běnjīn hěn ānquán.

The interest isn't high, but the principal is very safe.

我存在银行的钱利息非常低。

Wǒ cúnzài yínháng de qián lìxī fēicháng dī.

The money I have in the bank earns very low interest.

我每个月都要还利息。

Wǒ měige yuè dōu yào hái lìxī.

I have to pay the interest every month.

活期存款的利息很低。

Huóqīcúnkuǎn de lìxī hěn dī.

The interest on demand deposits is very low.