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(4) RISI Assume a city is comprised of three districts, A, B, and C. The following table provides the income distribution within each district: District A District B District C u - o - 1e income - eo - 1e income - eo - 1e income 100 $160,000 100 $120,000 200 $120,000 200 $5 0,00 100 $50,000 00 50,000 0 200 $20,000 200 $20,00 00 20,000 200 200 Calculate the R131 for this city (note: refer to the median income of the entire city)