Answer:
56
Step-by-step explanation:
The rule of 70 can be used to determine the amount of years it would take the GDP of a country to double given its growth rate
Number o year for GDP to double = 70 / growth rate of country
for country A = 70 / 5 = 14 years
for country B = 70 / 1 = 70 years
70 years - 14 years = 56 years