Sentence:  Taking the cue from his neighbours, Paul fed three 1000 <WSD>yen</WSD> notes into a machine beside the TV screen and the silent screen immediately exploded into a kaleidoscope of colours and instructions in Japanese below at least twenty pictures of sexy girls. ... Paul hesitated staring intently at the screen and the waiting girl while the 3,000 <WSD>yen</WSD> he had fed into the machine steadily dwindled at the rate of 50 <WSD>yen</WSD> a minute. 
Meaning of the word marked with <WSD> tags:  The unit of Japanese currency (symbol: ¥) since 1871, divided into 100 sen.