2. Suppose labor earnings for African-American and white workers are given as follows: African-Americans 30,000 20,000 Whites 50,000 50,000 Suppose half of white workers work in the North and half in the South. Compute the ratio of average earnings between African-Americans and whites for the country as a whole if: (a). 60 percent of African-American workers work in the South and 40 percent work in the North. [5 points] (b) 40 percent of African-American workers work in the South and 60 percent work in the North. [5 points]