If x is the average (arithmetic mean) of the product's net prices of ABC Pvt Ltd for the period 2013-2020, then calculate the difference between the average (arithmetic mean) of the products' net price greater than x and the average of the products' net price less than x for the period 2013-2020?

The average product net price would be: $$\frac{2000+5000+7000+5000+3000+6000+5000+8000}{8}=5125$$
The average of product prices less than this average price: 
$$\frac{2000+5000+5000+3000+5000}{5}=4000$$

The average product price greater than this average price would be:
$$\frac{7000+6000+8000}{3}=7000$$

The difference between these two averages would be 7000 - 4000 = 3000 million dollars. 
Hence, Option C is the correct answer.