I School Question: Which Appraisal Method Should Be Used With This Problem?

[Meandering]

Comparable price # of rooms pool

1 $100000 5 No Rooms No POOL
2 $91000 4 No 4 ROOMS NO POOL
3 $96000 3 Yes 3 Rooms YES POOL

The appraiser estimates that each bedroom has a worth of $10,000 and a swimming pool a worth of $15,000. Given the above information, what is the estimated value of the subject property using the average derived from the comparable?

I just need to known what appraisal method should be used to figure out the problem.
If comparable should be used should form version be used?

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