From the graph, read the growth at hour 8 and at hour 12.<br><br>
Growth in last 4 hours = growth at 12 h - growth at 8 h.<br>
Total growth = growth at 12 h - growth at 0 h.<br>
Percentage = (Growth in last 4 hours / Total growth) × 100%.<br><br>
Final Answer: Read from the graph and compute.