please solve ASAP

Exercise 2.3 (Saving, Investment, and the Net international Investment Position) In a two-period economy, saving in periods 1 and 2 is 5 (5'1 = 52 = 5) and investment in both periods is 10 (I1 = I2 = 10). 1. What is the current account in periods 1 and 2 (CA1 and 0.4.20? 2. What is the initial net international investment position (Bo)? 3. Assuming that the interest rate is 4 percent (r = 0.04), what is the trade balance in periods 1 and 2 (T31 and T32)