Answer:
The month that is lower than the lower control limit is February ($220,000).
Step-by-step explanation:
Giving the following information:
Highland Company's standard cost is $250,000. 
The allowable deviation is ±10%. 
Actual Fixed costs:
January $235,000 
February 220,000 
March 245,000 
April 265,000 
May 270,000 
June 280,000
First, we need to calculate the lower control limit:
Lower control limit= 250,000*0.9= $225,000
The month that is lower than the lower control limit is February ($220,000).