Final answer:
The actual total amount of the mixed expense after adjusting for the favorable spending variance and the unfavorable activity variance is $11,300.
Step-by-step explanation:
To calculate the actual total amount of the mixed expense, we first need to take the planned amount and adjust it for the variances. We start with the planned level of activity and the spending and activity variances. Given that the planned budgeted mixed cost for the 3,500 units was $12,000, we have a $900 favorable spending variance, and a $200 unfavorable activity variance, we can compute the actual cost.
The favorable spending variance indicates that the actual expenses were less than planned, so we subtract this from the planned cost. However, the unfavorable activity variance indicates that the actual expenses were higher than expected when adjusting for the level of activity, so we add this to the planned cost.
Thus, the actual total amount of this mixed expense is calculated as follows:
- Planned budgeted cost: $12,000
- Favorable spending variance: -$900
- Unfavorable activity variance: +$200
Actual cost = $12,000 - $900 + $200 = $11,300