a. rank gei's four projects according to the following four commonly used capital budgeting criteria: 1) payback period. 2) accounting return on investment. for purposes of this exercise, the accounting return on investment should be defined as follows: average annual after-tax profits (required investment)/2 3) internal rate of return. 4) net present value, assuming alternately a 10% discount rate and a 35% discount rate. b. why do the rankings differ? what does each technique measure and what assumptions does it make? c. if the projects are independent of each other, which should be accepted? if they are mutually exclusive (i.e., one and only one can be accepted), which one is best?