To follow is information about the units produced and total manufacturing costs for Pine Enterprises for the past six months. Month Number of units produced Total manufacturing costs January 7900 $8350 February 7,500 $8,000 March 6,600 $7,550 April 6,800 $7,650 May 4400 $6600 June 7,000 $7,750 Using the high-low method, what is the variable cost per unit? $2.00 $1.06 $1.50 $0.50