Answer:
Given:
The total transaction price for the sale of the stereo system and the extended warranty is $3,000.
The standalone price of each is $2,300 and $900, respectively.
The estimated cost of the assurance-warranty is $350.
Here, in this case the warranty expenses against sale of stereo is on basis of expected expenses .
Expected expenses in future is for certainty and sum collected against this expenses. Therefore, $ 900 is gathered under assurance-warranty while no cost is incurred. Therefore, they will credit the unearned warranty revenue of $ 900
Option (4) is correct.