Sarah is an independent programmer for an engineering firm and she needs to determine whether she should upgrade her computer she currently owns or trade her computer in to lease a new one. If she keeps her current computer, she will need to invest in immediate upgrades that cost $500 and it will cost $150 per year to operate at the end of year that follows. She will keep the computer for 4 years; at the end of this period, the upgraded computer will have a salvage value of $400. Alternatively, she could trade in her computer to lease a new one. She estimates that her current computer has a trade-in value of $1,000 and that there will be $450 due at lease signing. She further estimates that it will cost $300 per year to lease and operate the computer. The independent contractor's MARR is 10%. Which Excel entry should you use to to compute the EUAC of the upgrade alternative using the insider perspective? =PMT(10%,4,-500,400)+150 =PMT(10%,4,550)+300 =PMT(4%,10,-500,400)+150 =EUAC(10%,4,150,400)+500