In a simple 300 million-person world of all four-person families, if the poverty line is $12,500 and half of the 10 million families (with 40 million poor people) earn $10,000 and the other half earn $7,500, then the poverty rate is

a. 3.33% (10 million/300 million).

b. 13.33% (40 million/300 million).

c. 16.66% (50 million/300 million).

d. 96.33% ([300 million – 10 million]/ 300 million).