Find the following Present Values (PVs), as of October 1, 2017 a) The PV of $4000 due on September 30, 2018 at 3.75% interest. b) The PV of $6000 due on May 31, 2020 at 6.7% interest. c) The PV of $2000 due on September 1, 2019 at 4.2% interest. d) The PV of $8000 due on March 31, 2018 based on 6% simple interest