閱讀以下題目分析前請先熟悉此課題
2011 Paper 1 Question 7
2009 Paper 2 Question 10
2008 Paper 2 Question 12
2007 Paper 1 Question 6
2006 Paper 2 Question 10
2005 Paper 1 Question 6
2005 Paper 2 Question 12
2004 Paper 2 Question 12
2003 Paper 1 Question 5
[DSE數學教室-必修部份]百份比-定價(Percentage-Pricing) CE題目講解