The answer should be (a) 340.


1. 100 acres of grazing area is required for each rhinoceros
For 3000 rhinoceroses - it's 300,000 (i.e. 3000 * 100)
For 10% increase - it's 30,000 (i.e. 300 * 100)
Total: 330,000

2. 10,000 acres of watering area

Total: 330,000 + 10,000 = 340,000/1000 = 340.