百份比問題~~唔識做...- _ -

(a) 2002電器進口較2001下調的百份比
=[(262.9-257.3)/262.9]x100%
=2.13%

(b) 2005電器較2004上升的百分比
=[(314.8-298.5)/298.5]x100%
=5.46%

(c) 2001至2005期間汽車進口量每年平均上升的百份比
[(314.8-262.9)/262.9]x100%/4
=4.94%

希望你明點做,唔好只係睇完答案就算啦,咁先學到野

(a)百分減少=(原值﹣新值)/原值×100%
∴2002電器進口較2001下調的百份比
=(262.9﹣257.3)/262.9×100%
=5.6/262.9×100%
=2.13%

(b)百分增加=(新值﹣原值)/原值×100%
∴2005電器較2004上升的百分比
=(314.8﹣298.5)/298.5×100%
=16.3/298.5×100%
=5.46%

(c)百分增加=(新值﹣原值)/原值×100%
∴2001至2005期間汽車進口量上升的百份比
=(314.8﹣262.9)/262.9×100%
=51.9/262.9×100%
=19.74%
∴2001至2005期間汽車進口量每年平均上升的百份比
=19.74% / 4
=4.94%


2006-11-07 22:05:03 補充：
唔好意思，按錯制由於2001至2005期間總共有5年∴2001至2005期間汽車進口量每年平均上升的百份比=19.74% / 5=3.94%

a)2%

b)5%

c)4.6%