Sara's Systems manufactures audio systems for cars. Two models are produced: The Standard model has a budgeted price of $180 and a standard variable cost of $60. The Blaster model has a budgeted price of $460 and a standard variable cost of $140. At the beginning of the year, Sara estimated that she would sell 5,920 Blaster models and 23,680 Standard models. The actual results for the year showed that 7,410 Blaster models were sold for total revenues of $3,186,300. A total of 25,600 Standard models were sold for revenues of $5,120,000. Required: a. Compute the activity variance for the year. b. Compute the mix and quantity variances for the year. Complete this question by entering your answers in the tabs below. Compute the actlvity varlance for the year. (Do not round Intermedlate calculations. Indlcate the effect of each varlance by selecting "F" for favorable, or "U" for unfavorable. If there is no effect, do not select either option.)