A prefix for billion which is equal to _____ is called as billi.

100
10000
1000
10 E. None of the above

The correct answer is: E. None of the above.

A prefix for billion which is equal to 1000000000 is called as giga.

The prefix “billi” is not used in the International System of Units (SI) to represent any power of 10. It is sometimes used in informal contexts to represent 1000000000, but this is not an official SI unit.

The prefix “giga” is used in the SI to represent 1000000000. It is derived from the Greek word “gigas”, meaning “giant”.

The other options are all incorrect because they do not represent powers of 10.