Assume that GDP in the United States was 21.5T in 2019. Use "2019 dollars" for all answers/years.

A) assume that starting in 2020, the US grows at 2% per year until its GDP doubles. When (as in which year) would its GDP double? (3 points)

B) Use your answer in A as the starting year for this question (alternatively use 2050 if you don't know how to find ananswerfor A). Assume that after it doubles the first time, it starts growing at 5% per year. When would it double the second time? (3 points).

C) What would the GDP for the United States be in the year you calculated in B? (3 points).

D) List two possible ways to increase long-term growth for the United States (based on "mainstream (i.e. textbook) view of economics". (3 points)