Ferry Chemical uses a standard cost system to account for the costs of its production of Chemical X. Standards are 0.83 gallons of materials at $92.00 per gallon and 6.0 hours of labor at a standard wage rate of $3.05. During September, Ferry Chemical produced 4,600 gallons of Chemical X. Ferry Chemical purchased and used 3,660 gallons of materials at a total cost of $406,920. Payroll totaled $76,921 for 26,730 hours worked. Required: a. Calculate the direct materials price variance. Note: Do not round your intermediate calculations. Indicate the effect of variance by selecting "Favorable", "Unfavorable", or "None" for no effect (i.e., zero variance). b. Calculate the direct materials quantity variance. Note: Indicate the effect of variance by selecting "Favorable", "Unfavorable", or "None" for no effect (i.e., zero variance).) c. Calculate the direct labor rate variance. Note: Do not round your intermediate calculations. Indicate the effect of variance by selecting "Favorable", "Unfavorable", or "None" for no effect (i.e., zero variance). d. Calculate the direct labor efficiency variance. Note: Indicate the effect of variance by selecting "Favorable", "Unfavorable", or "None" for no effect (i.e., zero variance). a. Price Variance b. Quantity Variance c. Rate Variance d. Efficiency Variance