I need help with a and b

Pane Question 2 Imagine that the U.S. economy finds itself in the following situation: a government budget deficit of $100 billion, total domestic savings of $1,500 billion, and total domestic physical capital investment of $1,600 billion. a) According to the national saving and investment identity, what will be the current account balance? $200 billion b) What will be the current account balance if investment rises by $50 billion, while the budget deficit and national savings remain the same? $250 billion