Marigold Corp. produces replacement adapter power charger cords that it sells for $20 each. Each power charger cord costs $7 of variable costs to make. During April, 1000 power charger cords were sold. Fixed costs for April were $3 per unit for a total of $3000 for the month. How much will Marigold Corp's operating income increase for each $2200 increase in monthly revenue? Not enough information to determine the answer. O $1430 $990. O $550