Answer:
17.5years
Explanation:
The rule of 70 is used to determine how long it would take for a number to double depending on its growth rate. This is calculated with the formula;
70/Annual rate of return(in percentage)
Since we have determined the annual growth rate of the country to be 4 percent a year, we can approximately determine how many years it ill take to double its real GDP with the formula;
70/4
= 17.5years
