McDonalds current computer system has a salvage value now of $5,000, which will fall to $4,000 by the end of the year. The cost of lower productivity linked to this computer system is $3,000 this year. A potential new system costs $12,000 and has the following salvage values and lost productivity for each year. McDonalds uses a before-tax interest rate of 10%. Should McDonalds replace its computer system this year? Why