Coronado Industries produces replacement adapter power charger cords that it sells for $30 each. Each power charger cord costs 56 of variable costs to make. During April, 500 power charger cords were sold Fixed costs for April were 54 per unit for a total of $2000 for the month. How much will Murphy's operating income increase for each $3000 Increase in monthly revenue? O $1500 Not enough information to determine the answer. O $1700 $2400