"Ninety four books"
Translation:책 아흔네 권
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It's not explicitly stated in the tips, but any native Korean word ending in 1, 2, 3, 4, or 20 will adopt the short form (e.g., 하나 --> 한, 둘 --> 두) when being used for counting things. For instance, 120 and 34, when written using native Korean, will adopt the short form: 온스무 (archaic; 100 and above normally use sino-Korean), 서른네.
See the part about Irregulars.
Anytime we're counting books (or more generally, whenever we're using the counter 권) we use Native Korean.
Whether we use native or Sino-Korean depends on the corresponding counter (though there are cases where it's ambiguous). As a general rule, counters associated with counting discrete things (like books, number of items, number of people, etc) Native Korean is used, whereas Sino-Korean is used in cases like phone numbers, address, floor (of a building), etc. Also, in modern Korean, any number 100 or greater will be rendered in Sino-Korean, even if the counter suggests using Native Korean. (see https://www.duolingo.com/skill/ko/Numbers_1/tips-and-notes)