INTEREST RATE - The price charged per unit of money borrowed per year, or other unit of time, usually expressed as a percentage.
( ( ( ( INTEREST RATE ) - ) ( ( ( ( ( The price ) ( charged ( per ( unit ( of ( money ( borrowed ( per year ) ) ) ) ) ) ) ) , ) or ) ( ( ( ( other unit ) ( of time ) ) , ) ( usually ( expressed ( as ( a percentage ) ) ) ) ) ) ) . )
(ROOT (NP (NP (NN INTEREST) (NN RATE)) (: -) (NP (NP (NP (DT The) (NN price)) (VP (VBN charged) (PP (IN per) (NP (NP (NN unit)) (PP (IN of) (NP (NP (NN money)) (VP (VBN borrowed) (PP (IN per) (NP (NN year)))))))))) (, ,) (CC or) (NP (NP (JJ other) (NN unit)) (PP (IN of) (NP (NN time))) (, ,) (VP (ADVP (RB usually)) (VBN expressed) (PP (IN as) (NP (DT a) (NN percentage)))))) (. .)))
Interest rate is defined as the total amount of money borrowed. 
( ( Interest rate ) ( ( is ( defined ( as ( ( the ( total amount ) ) ( of ( money borrowed ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Interest) (NN rate)) (VP (VBZ is) (VP (VBN defined) (PP (IN as) (NP (NP (DT the) (JJ total) (NN amount)) (PP (IN of) (NP (NP (NN money)) (VP (VBN borrowed)))))))) (. .)))