4. A nation’s rate of economic growth in 2003 was 5 percent. It accumulated capi-
tal at a rate of 5 percent and added to its employment of labor at a rate of 5
percent. The proportionate increase in real GDP in response to a proportionate
increase in capital was 0.2, and the proportionate rise in real GDP following a
proportionate increase in labor was 0.8. What was the growth in the overall
productivity of labor and capital during 2003?