You are analyzing the property, plant, and equipment (PPE) investments of two manufacturing companies, General Electric (GE) and Siemens AG, for the fiscal year 2023.

Requirements:

1. GE reported PPE investments totaling $20 billion for the fiscal year 2023. Siemens reported PPE investments totaling $18 billion during the same period.
2. Calculate the percentage difference in PPE investments between GE and Siemens.

Discuss the significance of PPE investments for GE and Siemens in terms of capacity expansion and operational efficiency