Sundland company proces flash dirces for computers, which it sells for 35 each. Each flash drive costs $7 of variable costs to make. During April, 1100 drives were sold. Fixed costs for April were 4 per unit for a total of 6600 for the month. How much does Sunland's operating income increase for each 2600 increase in revenue per month?

a. 38500

b. $2080

c. Not enough information to determine the answer

d. $2600