13. The following problems address issues related to present value. a. A customer will pay $200 per quarter at the beginning of each quarter to her Internet provider for the next 7 years. Determine the net present value of these payments if the annual discount rate is 7.5%. b. If today is July 14, 2014, and the cost of capital r = 8%, what is the net present value of the following cash flows as of July 14, 2014: $-1,500 $ +800 $ +1500 $ +975 $ +885 $ +925 09/25/14 07/08/15 08/22/16 04/14/17 10/18/18 12/09/19