Sunland Company produces flash drives for computers, which it sells for $30 each. Each flash drive costs $7 of variable costs to make. During April, 800 drives were sold. Fixed costs for April were $2 per unit for a total of $1600 for the month. How much does Sunlands operating income increase for each $1200 increase in revenue per month? $920. $360. $24000. Not enough information to determine the answer.