Income statement is as follows:

Sales (10,000 units) $150,000

Less variable costs -48,000

Contribution margin $102,000

Less fixed costs -24,000

Net income $78,000

If sales increase by 1,000 units, profits will:

a) increase by $4,800

b) increase by $12,000

c) increase by $8,000

d) increase by $10,200