Answer:
Total Dividend = $20000
Explanation:
Total Income for 3 Years = 3*Average income
                      = 3* 6000 = $18000
Opening Retained Earnings $10,000
Closing Retained Earnings $13,000
Net Utilisation for Dividend = 13000 - 10000 = $2000
Total Dividend =Total Income+Net utilisation from RE
            =18000 + 2000 = $20000