This problem was never solved. would someone please look at it. It's an accounting problem ...what is the aw of the defender and the aw of the challenger.

9-10. An existing robot is used in a commercial material laboratory to handle ceramic samples in the high-temperature environment that is part of several test procedures. Due to changing customer needs, the robot will not meet future service requirements unless it is upgraded at a cost of $2,000. Because of this situation, a new advanced technology robot has been selected for potential replacement of the existing robot. The accompanying estimates have been developed from information provided by some current users of the new robot and data obtained from the manufacturer. The firms before-tax MARR is 25% per year. Based on this information, should the existing robot be replaced? Assume that a robot will be needed for an indefinite period.(9.4, 9.7)

Defender
Current MV	$38,200
Upgrade cost (year 0)	$2,000
Annual expenses	$1,400 in year one, and increasing at the rate of 8% per year thereafter
Useful life (years)	6
MV at end of useful life	?$1,500

Challenger
Purchase price	$51,000
Installation cost	$5,500
Annual expenses	$1,000 in year one, and increasing by $150 per year thereafter
Useful life (years)	10
MV at end of useful life	$7,000