Exam questions - Chapters 3 and 4

In 2000, the number of unemployed individuals was 100, and the number of employed individuals was 900. In 2008, the number of unemployed individuals was 200 and the number of employed individuals was 1900. Which of the following is correct ?
Nominal GDP is 45,000 in 2005 and 60,000 in 2006. Real GDP measured in 2004 dollars (i.e., base year is 2004) is equal to 30,000 in 2005, and 40,000 in 2006. What can we say with certainty?
Two countries have the same production function and quantities of production factors, except for the stock of capital. What will be the effect on productivity of an additional unit of capital in the two countries?
Consider the following production function : Y = A· F(L,K,H,N) with A being technological knowledge, L labor, K physical capital, H human capital and N natural resource endowments. Let’s assume that the production function exhibits constant returns to scale, and declining marginal factor productivity. Which of the following is correct ?