Ferry Chemical uses a standard cost system to account for the costs of its production of Chemical X. Standards are 0.61 gallons of materials at $97.00 per gallon and 4.7 hours of labor at a standard wage rate of $5.17. During September, Ferry Chemical produced 6,600 gallons of Chemical X. Ferry Chemical purchased and used 3,960 gallons of materials at a total cost of $396,920. Payroll totaled $130,267 for 26,230 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 (L.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)