Nation a's real gdp was $520 billion in 2013 and $550 billion in 2014. its population was 150 million in 2013 and 155 million in 2014. on the other hand, nation b's real gdp was $200 billion in 2013 and $210 billion in 2014; and its population was 53 million in 2013 and 55 million in 2014. which of the following statements is true?