問數t^t

中3 ch2
2c   {6}  {7}  {9}

6a. 設年利率為 y

　$1600 (1+ y/2)^2 = $1600 + $81
　　　　　　　　　y = [[font=標楷體]√[/font](1681/1600) - 1] x 2
　　　　　　　　　y = 0.025 x 2
　　　　　　　　　y = 5%

6b. 利息 = $1600 (1+ 5%/2)^4 - $1600
　　 大約= $166

7. 還款1次後 = $20000 (1+2%) - $5000 = $15400
　 ．．2．． = $15400 (1+2%) - $5000 = $10708
　 ．．3．． = $10708 (1+2%) - $5000 ~ $5922
　 ．．4．． = $5922 (1+2%) - $5000 ~ $1040

9a. 本利和 = $50000(1+3%)^2 = $53045

9b. 4年 = $53045(1+4%)^6 = $67119

9c. 總利息 = $67119 - $50000 = $17119


請看：
[url]http://forum.eyankit.com/viewthread.php?tid=12974&extra=page%3D1[/url]

5分鐘後 lol wor
仲唔答佢