Nation a's real gdp was $520 billion in 2015 and $550 billion in 2016. its population was 150 million in 2015 and 155 million in 2016. on the other hand, nation b's real gdp was $200 billion in 2015 and $210 billion in 2016; and its population was 53 million in 2015 and 55 million in 2016. which of the following statements is true?
multiple choice
a. nation a's gdp per capita increased from 2015 to 2016, while nation b's decreased.
b. nation a's and nation b's gdp per capita both increased from 2015 to 2016.
c. nation b's gdp per capita increased from 2015 to 2016, while nation a's decreased.
d. nation a's and nation b's gdp per capita both decreased from 2015 to 2016.