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Over the past 20 years, an economy's total output, capital stock and labor force have grown by the amounts shown in the table below. The measurements are in real terms. Use the information to answer the questions below. 1990 2010 Percent Change Total Output (Y) 1,000 2.047 Capital Stock (K) 2,500 3,688 Labor Force (N) 500 843 Hint: Before you answer any questions, find the percent changes in total output, capital stock and labor force first. Enter all values as percentages rounded to one decimal place. a. Assume that ak = 0.3 and an = 0.7. What is the contribution to economic growth from growth in capital?% What is the contribution to economic growth from growth in labor?% What is the contribution to economic growth from productivity? ]%. b. Assume that ak = 0.5 and an = 0.5. The contribution to economic growth from growth in capital is ]% The contribution to growth from labor is % The contribution to growth from productivity is 9%