Neptune Rentals offers a boat rental service. Consider the following costs of the company over the relevant of 5.000 to 8,000 hours of operating time for its hours: Hours of Operating Time 5,000 6,000 7,000 8,000 Total costs Variable costs Fixed costs $ 40,000 210,000 52 2 S? 2 $? 2 Total costs $250.000 S2 2 $2 Question: What is the variable cost per unit? OA OB.56 OC58