maths...前輩們幫幫忙...20點

Question

香港汽車進口數量近年出現上升趨勢,以下為2001至2005年汽車進口數量的統計:

年份 數量(千輛) 年份 數量(千輛)
2001 262.9 2004 298.5
2002 257.3 2005 314.8
2003 286.2

請計算:
(a)2002年汽車進口數量較2001年下調的百分比..(請各位前輩例埋條式給小弟參考)
(b)2005年汽車進口數量較2004年上升的百分比..(請各位前輩例埋條式給小弟參考)
(c)2001年至2005年間汽車進口數量每年平均上升的百分比..(請各位前輩例埋條式給小弟參考)

年份....................數量(千輛)............ 年份.................. 數量(千輛)
2001....................262.9....................2004..................298.5......
2002....................257.3....................2005..................314.8....
2003....................286.2

Answer 1

a)
(262,900 - 257,300) / 262,900 x 100%
= 5,600 / 262,900 x 100%
= 2 . 13%

b)
(314,800 - 298,500) / 298,500 x 100%
= 16,300 / 298,500 x 100%
= 5 . 46%

c)
[(314,800 - 262,900) / 262,900 x 100% ] / (5 - 1)
= [51900 / 262,900 x 100%] / 4
= 19 . 74% / 4
= 4 . 935%

Answer 2

a)(262,900-257,300)/262,900x100%
= 5,600/262,900x100%
= 2.13%
b)314,800-298,500)/298,500x100%
= 16,300/298,500x100%
= 5.46%
c)[(314,800-262,900)/262,900x100% ]/(5-1)
= [51900/262,900x100%]/4
= 19.74%/4
= 4.935%