Referent power is a lot like charisma

The main purpose of an annuity is to protect against:

A) premature death B) outliving one's income C) growing old D) none of the above

There is a 30% probability that an office building will be sold after 5 years for $30 million, a 50% probability that it will be sold for $20 million and a 20% probability that it will be sold for $10 million

What is the expected value of the office building in 5 years? A) $20 million B) $21 million C) $30 million D) $10 million