Answer to Question #227147 in Macroeconomics for Priest

Question

How many years will it take for GDP to double from R40 billion to R80 billion if the growth rate is 

0.25% per year in South Africa?

A. 17.5

B. 10

C. 280

D. 160

Answer 1

The number of years it takes for a country's economy to double in size is equal to 70 divided by the growth rate, in percent.

Hence

For South Africa to double from R40 to R80

No of years = $\frac{70}{0.25}=280$