Answer:
$134,400
Step-by-step explanation:
To find the increase in Variable Cost due to rise in the number of units produced, first we need to find the per unit variable cost and then multiply that per unit cost with the new number of unit produced, to find the total variable cost of 420,000 units.
$120,000 / 375,000 units
Per unit variable cost = $0.32 per unit
Since the Fixed Cost remains constant. Let us multiply $0.32 per unit variable cost with 420,000 units, to find the total variable cost.
$0.32 per unit x 420,000 units
Total Variable Cost = $134,400