please show the work. Thank you

Suppose Donald Trump has unlimited funds with which to invest and is considering investing in the following projects. Suppose the real interest rate is currently r_1 = 4%. Which projects will actually be invested in? What is the value of total planned investment I^P? Suppose the real interest rate increases to r_2 = 6%. Which projects are now invested in? What is the new value of total planned investment? Plot these two points on a graph with r on the horizontal axis and f[r) on the vertical axis Connect them with a line Find the value of the slope of this line. When r = 0% find total expected returns