Result 200 is 0.0000025% of 8 billion.

Calculation 

The formula to calculate what percentage a value (Part) is of a total value (Whole) is:

$(\text{Part}/\text{Whole})\times 100\%$

In this case: 

• Part: 200
• Whole: 8,000,000,000 (8 billion) 

Steps: 

1. Divide the part by the whole:
   
   

   $200/8,000,000,000=0.000000025$
2. Multiply by 100 to express as a percentage:
   
   

   $0.000000025\times 100=0.0000025\%$