1.(15 points) Over the past 20 years an economy's total output has grown from 1000 to 1250, its capital stock has risen from 2700 to 3375, and its labor force has increased from 800 to 920. All measurements are in real terms. Calculate the contributions to economic growth of growth in capital, labor, and productivity, assuming that (1K = 0.25and 0N = 0.75