Sheffield's Custom Construction Company is considering three new projects, each requiring an equipment investment of $25,520. Each project will last for 3 years and produce the following net annual cash flows. Year AA BB CC $8,120 $11,600 $15,080 NP Unresolved 11,600 13,920 13,920 11,600 12,760 Total $32,480 $34,800 $41,760 The equipment's salvage value is zero, and Sheffield uses straight-line depreciation. Sheffield will not accept any project with a cash payback period over 2 years. Sheffield's required rate of return is 12%