Answer:
$15 per Unit
Step-by-step explanation:
Given:
Highest unit = 4,000
Total cost for higher unit = $110,000
Lowest unit = 2,500
Total cost for lower unit = $87,500
Computation by High-low method
 = (Total cost for higher unit - Total cost for lower unit) / (Highest unit - Lowest nit) 
( $110,000 - $87,500) / ( 4,000 – 2,500) 
 [$22,500 / 1,500]per unit 
 = $15 Per Unit