x=23    y=2.23%
3년의 증가율을 구하려할때 이식을써서 (x*(1+y)^3,0)
(23*(1+2.23%)^3)=25가 나오는데요
나온숫자 25를 역으로 저 증가율(y)을 써서 감소하는걸 구하려면
(25/(1+2.23%)^3)= 23?
이렇게 나누기하면 맞는건가요?ㅡㅡ;;;

산수안한지 너무오래되어서말이죠..ㅠㅠ;;;
좀알려주세여;;;