a. According to the Rule of 70, how many years will it take a country to double its output at each of the following annual growth rates?

0.5 percent: ........._____ years

1 percent: ............_____ years

1.4 percent: ........._____ years

2 percent: ............_____ years

2.8 percent: ........._____ years

3.5 percent : ........._____ years

7 percent: .........._____ years

b. If a country has $100 billion of real GDP today, what will its real GDP be in 50 years if it grows at an annual growth rate of

1.4 percent? ........._____

2.8 percent? ........._____

7 percent? ............_____