Over the past 20 years, an economy's total output, capital stock (k) and labor force (n) have grown by the amounts shown in the table below: 1990 2010 Percent change Total Output 1,000 2,115 Capital Stock 2,500 3,803 Labor Force 500 860 Assume that ak=0.5 and an=0.5. What is the contribution to economic growth from productivity? Over the past 20 years, an economy's total output, capital stock (k) and labor force (n) have grown by the amounts shown in the table below: 1990 2010 Percent change Total Output 1,000 2,115 Capital Stock 2,500 3,803 Labor Force 500 860 Assume that ak=0.5 and an=0.5. What is the contribution to economic growth from productivity? 1.23% 45.5% 49.4% 26.1%