A company owns a machine (Defender) with a current market value of $5,000. It can be kept for up to 3 more years. The operating costs for the next three years are expected to be$4,000, $5,000, and$6,000 respectively, with a salvage value of zero at the end of any year. A new machine (Challenger) has a calculated minimum Annual Worth (at its ESL) of $6,500/year. If the MARR is 10%, should the defender be replaced now?