Need business and finance help using the high-low method: what is the variable cost per unit

Thomas Train has collected the following information over the last six months.

Month Units produced Total costs
March 10,000 $25,600
April 12,000 26,200
May 19,400 27,600
June 13,000 26,450
July 12,000 26,000
August 15,000 26,500

Using the high-low method, what is the variable cost per unit?

 
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