Agile Time Systems, Inc. is considering the development of one of two mutually exclusive new pieces of timing equipment to be used in canine agility trials. Each will require a net investment of $4,000. The cash flows for each project are shown below:

Year Model A Model B

1 $3,500 $1,450

2 $3,260 $3,750

3 $1,810

Model A is of higher-than-average risk, and Model B is of lower-than-average risk. The firms WACC is 13%. To risk-adjust, the firms policy is to add 2% to WACC for projects that are riskier than average and to deduct 3% from WACC for projects that have less than average risk.

a) Which model should Agile Time choose based on the NPV criterion and why?

b) Which model should Agile Time choose based on the IRR criterion and why? (Make sure to write the mathematical equations!)