O On-Site Testing Service has recelved four investment propasals for consid- cration. Two of the proposals, XI and X2, are mutually exclusive. Tho other two proposals, Y1 and Y2 are also mutually exclusive Proposa Y1 is con- dngent on XI and Y2 is contingent on X2. Other than these restrictions, any combination of proposals (including null) is feasible. MARR is 10%/y. The expected cash Bows for the proposals are shown below. An internal rate of return analysis is to be conducted. End of Year X1 x2 Y1 -$10,000$15,bo0 $2,600 -$8,000 $9,000 1 through 8 $1,600 $2,500 $3,500 a. List all the alternatives to be considered. b. Deteirhine which (if any) proposals Oa-Site Testing should acoept