A $50,000 investment is expected to save $17,513 per year, in today’s dollars (real). Assume N=4, inflation f=6%, and MARRR=20% (real): a) What is the IRRR? b) What is the actual IRRC? c) Use the Real $ and MARRR to find NPW. d) Use the Actual $ and the MARRC to find NPW.