To convert the line chart of transaction prices for properties like Carmi Mansions, The Pinnacle@Duxton, and Enchante into percentage growth, calculate the year-over-year (YoY) or quarter-over-quarter (QoQ) percentage change in prices. Use the formula: \((\text{Current Price} - \text{Previous Price}) / \text{Previous Price} \times 100\). For example, a price increase from $1,000,000 to $1,039,000 results in a 3.9% QoQ growth.