Answer:
Direct labor rate variance = (SR - AR)  AH
 AH
October = ($15 - $15.20)   16,250 = - $3,250 Unfavorable
 16,250 = - $3,250 Unfavorable
November = ($15 - $15.25)   22,000 = - $5,500 Unfavorable
  22,000 = - $5,500 Unfavorable
Direct Labor Efficiency Variance = (SH - AH)   SR
  SR
October = (16,800 - 16,250)   $15 = 8,250 Favorable
 $15 = 8,250 Favorable
November = (18,000 - 22,000)  $15 = - $60,000 Unfavorable
 $15 = - $60,000 Unfavorable 
Direct Labor Cost Variance = Standard Cost - Actual Cost
October = $252,000 - $247,000 = $5,000 Favorable
November = $270,000 - $335,500 = - $65,500 Unfavorable
Explanation:
Computing variances for each month
Particulars                            October                  November          Equation
Total units produced           5,600 units             6,000 units            (a)
Standard hour per unit           3 hours                   3 hours                (b)
Total standard hour SH          16,800                   18,000              (c) = (a)*(b)
Total standard cost 
of labor @ $15 SR per hour  $252,000                $270,000          (d) = (c) * 15
Actual hours used AH           16,250                    22,000                  (e)
Actual cost                            $247,000               $335,500                (f)
Actual Rate per hour AR          $15.20                   $15.25              (g) = (f)/(e)
Using the above information we have
Direct labor rate variance = (SR - AR)  AH
 AH
October = ($15 - $15.20)   16,250 = - $3,250 Unfavorable
 16,250 = - $3,250 Unfavorable
November = ($15 - $15.25)   22,000 = - $5,500 Unfavorable
  22,000 = - $5,500 Unfavorable
Direct Labor Efficiency Variance = (SH - AH)   SR
  SR
October = (16,800 - 16,250)   $15 = 8,250 Favorable
 $15 = 8,250 Favorable
November = (18,000 - 22,000)  $15 = - $60,000 Unfavorable
 $15 = - $60,000 Unfavorable 
Direct Labor Cost Variance = Standard Cost - Actual Cost
October = $252,000 - $247,000 = $5,000 Favorable
November = $270,000 - $335,500 = - $65,500 Unfavorable