At an Activity Level of 6,000 Units the Cost for Maintenance

Multiple Choice

At an activity level of 6,000 units the cost for maintenance is $7,200 and at 10,000 units the cost for maintenance is $11,600.Using the high-low method,the cost formula for maintenance is?

A) $1.16 per unit.
B) $1.20 per unit.
C) $600 plus $1.10 per unit.
D) $1,200 plus $1.10 per unit.