What are interest rates?

[Stupy]

Business English Lesson, Advanced Level

ESL/EFL Test #11 "Finance (3)", question 10

Interest ......... are at their lowest level since the 1950's.

(a) figures
(b) rates
(c) numbers
(d) standards

Business English Lesson, Advanced Level

ESL/EFL Test #11 "Finance (3)", answer 10

Interest rates are at their lowest level since the 1950's.

Correct answer: (b) rates
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I find it difficult to answer this test. I am not quite sure, but i think the correct answer is figures. Please, send me an explanation for the test:
Interest.......are at their lowest level since the1950`s.
Thank you in advance.

Nana Rodonaia

[Mister Micawber]

Interest rates: 'rate' is a percentage, which is the way interest is calculated and paid.
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Native English teacher at Mister Micawber's