Answer:
Option (a) is correct.
Step-by-step explanation:
Pretax income = Contribution - Fixed cost
Contribution = Pretax income + Fixed cost
 = $1,824,000 + $1,444,000
 = $3,268,000
Sales - Variable Cost = Contribution
Variable Cost = Sales - Contribution
 = (380,000 electric screwdrivers × $20.40 each) - $3,268,000
 = $7,752,000 - $3,268,000
 = $4,484,000