A computer call center is going to replace all of its incandescent lamps with more energy efficient fluorescent lighting fixtures. The total energy savings are estimated to be ​$ per​ year, and the cost of purchasing and installing the fluorescent fixtures is ​$. The study period is ​years, and terminal market values for the fixtures are negligible. a. What is the IRR of this​ investment? b. What is the simple payback period of the​ investment? c. Is there a conflict in the answers to Parts​ (a) and​ (b)? List your assumptions. d. The simple payback​ "rate of​ return" is ​1/. a. The IRR of the investment is nothing​%. ​(Round to one decimal​ place.) b. The simple payback period of the investment is nothing years. ​(Round up to the next whole​ number.) c. Select all the correct assumptions below. A. The IRR will signal an acceptable​ (profitable) project if the MARR is less than ​%. B. The IRR will signal an acceptable​ (profitable) project if the MARR is higher than ​%. C. The value of may indicate a poor project in terms of liquidity. D. The value of may indicate the best project in terms of liquidity. d. The simple payback​ "rate of​ return", ​1/​, is nothing​%. ​(Round to one decimal​ place.)