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수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
최근 발생한 코로나19 때문에 벚꽃축제에 오려던 일정을 취소하는 관광객들이 생겼다.
조사해보니 축제 방문 예정이었던 2인 일행중 50%가 일정을 취소했고, 4인 일행중에는 일정을 취소한 일행이 없고, 8인 일행중 75%가 일정을 취소했다고 한다.
축제에 오는 사람들에게 벚꽃아이스크림을 팔려했던 상인들은 아이스크림의 가격을 올려야 하는 상황이다.
원래 1개당 가격을 2000원이라 할때, 아무도 일정을 취소하지 않았을때의 75%이상 돈을 벌기 위한 새로운 아이스크림 1개 가격의 최솟값은 얼마일까?
단, 벚꽃축제에 방문하는 모든사람들에게 아이스크림을 하나씩 판매하며, 원래 방문하려했던 4인일행의 수와 8인 일행의 수는 같다.
풀이 필수입니다!
※<도전 20제!>는 여러주제중 임의로 20가지 주제를 골라 문제를 내는 MathlabJ의 프로젝트입니다. 문제를 좀더 재밌고, 색다른 주제로 내보고 싶어서 하게 되었습니다.
지금 바로
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