Business firms in Aggieland has the following seven investment projects (A to G) in 2020. Project Investment ($) Expected Rate of Return A 8% B 7% C 6% D 5% E 4% F 3% G 2% $10 $20 $30 $40 $50 $50 $50 a. (2 Points) Compute total amount of investment that firms in Aggieland undertake at each real interest rate and fill in the table below. [You do not need to show your computation works] Real Interest Rate Total Investment ($) 8% 7% 6% 5% 4% 3% 2% b. (3 Points) Draw a diagram of investment demand curve.