Answer:
1. Variable cost per unit = [Total cost at highest level - Total cost at lowest level] / (Highest level of unit- Lowest level of unit)
Variable cost per unit = [$309,120 - $198,720] / [3,795 - 1,495]
Variable cost per unit = $110,400 / 2,300
Variable cost per unit = $48
Fixed costs = Total cost at highest level - [Variable cost per unit*Highest level of unit]
Fixed costs = $309,120 - [$48*3,795]
Fixed costs = $309,120 - $182,160
Fixed costs = $126,960
2. Total cost = Fixed cost + Variable cost
Total cost = $126,960 + $48*(1,900 units)
Total cost = $126,960 + $91,200
Total cost = $218,160