The CFO of Taanish Inc. has gathered the following information: Selling price per unit is $2,500 and variable costs per unit sold are $1,550. During the year, 12,000 units were sold. Net income for the year was $6,225,000. Income taxes for the year were $750,000 and interest expense was $1,000,000. By how much will net income increase if sales increase by 12%? 

a) 18.9% 

b) 19.6% 

c) 25.1% 

d) 30.9%