Please help with the problem below. I have part A correctly finished, but the other than the answers being favorable, my answers for part B are incorrect. I'd appreaciate the help. Thank you.

Beatrice Math Tutors offers two tutoring models: individual and group. The individual model provides one-on-one tutoring while the group model consists of group of no more than four students. The individual model has a budgeted average price of $275. The group model has a budgeted average price of $75. The manager of the tutoring center believes that 65 percent of the customers will choose the group model. The individual model averages $185 and the group model averages $45 in budgeted variable cost. The manager estimates that about 160 people will purchase tutoring services in any month. For October, the tutoring center served a total of 170 customers, including 110 that chose the group option. Required: a. Compute the sales activity variance for the tutoring center for October. b. Compute the mix and quantity variances for October. Complete this question by entering your answers in the tabs below. Compute the mix and quantity variances for October. Note: Do not round intermediate calculations. Indicate the effect of each variance by selecting "F" for favorable, or "U" for unfavorable. If there is no effect, do not select either option