Answer:
Total standard cost per unit is $41.98
Explanation:
Computation of  Stefani’s total standard cost per unit.
Direct materials ((3.40 pounds+0.60 pounds)×($ 5×96%))  = 19.20
Freight Cost ($ 0.40×(3.40 pounds+0.60 pounds))        =  1.60
Direct labor (1.00×($ 10.00+$ 3.90))                    = 13.90
Setup, cleanup, and downtime (0.20×($ 10.00+$ 3.90))   =  2.78
Manufacturing overhead ($ 4.50×1.00)                 =  4.50
Total standard cost per unit                          =  41.98