請問天山4-11題目

[lalazoo]

Q11:
At the end of each year, the value of a certain antique watch is c percent more than its
value one year earlier, where c has the same value each year. If the value of the watch
was k dollars on January1, 1992, and m dollars on January 1, 1994, then in terms of m
and k, what was the value of the watch, in dollars, on January 1, 1995 ?

A. m +1/2(m – k)
B. m +(m- k)m /k /2)
C. m*根號M/ 根號k
D. m^2 / 2K
E. km^2

請問這堤怎麼算
我腦經轉不過來
答案是C

感謝各位

[micki]

按照原題 可知 K*(1+C%)[sup]2 [/sup]= m

1+C% = 根號 m / 根號 k

1995年 = K*(1+C%)[sup]3 [/sup]
= K*(1+C%)[sup]2 [/sup] *(1+C%)
= m *(1+C%)
= m * (根號 m / 根號 k )

所以答案是C

[lalazoo]

哇哇
我真是腦袋裝變變
怎麼沒有想到
慚愧...
我還是很嫩
感謝MICKI....