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수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
니유토갬
2020.06.21 03:00
조회 705
니유는 오늘 수학동아를 사러 서점에 갔다.
서점에 가보니, 정가가 13500원이였다.
하지만, 할인이 적용되어서, 30%할인이 되었다.
수학을 좋아하는 친구들 20명에게 이 수학동아를 사주려고 한다.
다행히도, 함풀문에서 100문제를 낸 사람들에게는 20% 추가 할인을 해주었다.
(니유는 100문제를 냈다고 가정)<-물론 아직은 그렇게까지는 안 냈지만 ㅠㅠ
원래 할인과, 한 번 할인한 가격에 추가할인을 적용할 때, 니유는 수학동아 20권을 사는데 얼마가 필요할까?
(단, 답이 깔끔~히 떨어지지 않을 경우에는, 그냥 반올림)
또한, 니유가 원래 내야 할 가격보다 몇 원 더 싸게 샀는가?
(이 때, 원래 내야 할 가격은 아~예 할인 안 한 것입니다!)
풀이과정은 자세한 식을 포함해서 써주세요!
풀이 없으면, 부분해결!
-
아엘
Lv.7
2020.06.21 03:14
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조이
Lv.8
2020.06.21 05:02
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