Three possibilities have probabilities 0.4, 0.4 and 0.2 and values $10, $20, and $30 respectively. The expected value is:

A nation's real GDP was $250 billion in 2013 and $265 billion in 2014. Its population was 120 million in 2013 and 125 million in 2014. What is its real GDP per capita in 2014?

A.  $2,120 per person B.  $212 per person C.  $21,200 per person D.  $205 per person

Best Lights wants to prevent Bright Lights from entering the light bulb market. If Best Lights advertises that it will always undercut any competitor's price, the effect of advertising ________ Best Lights' profits due to its cost and ________ Best Lights' profits due to a(n) ________ in its demand.

A) decreases; increases; increase B) decreases; decreases; decrease C) increases; increases; increase D) decreases; decreases; increase