In 2018, the U.S. GDP was approximately $ 2.5 trillion. However, India is growing faster than the U.S. a. If the U.S. economy grows at 3% per year, in what year will the U.S. GDP double to $40 trillion?b. If India’s economy grows at 7% per year, in what year will its GDP double to $ 5 trillion?

The year that the U.S. GDP double to $40 trillion, given the growth rate, is 2042The year that India's GDP will double to $5 trillion, given the growth rate is 2028 How to find the number of years till things double?When given the rate of increase, one can be able to find out the year that things will double by using the Rule of 72. The number of years till U.S. GDP doubles is:= 72 / Growth rate = 72 / 3= 24 years U.S. GDP would double in the year:= 2018 + 24 = 2042The number of years till India's GDP doubles is:= 72 / 7= 10 years India's GDP would double in the year:= 2018 + 10= 2028 Find out more on GDP doubling at https://brainly.com/question/26600742#SPJ1