The following information is available regarding the total manufacturing overhead for Waleska Industries for a recent four month period.

Machine Hrs Mfg Overhead

April 90,000 $170,000

May 80,000 $153,000

June 110,000 $198,000

July 95,000 $181,000

Using the high-low method, compute the variable element of manufacturing overhead cost per machine hour

$1,50 per machine hour

$2.10 per machine hour

$1.40 per machine hour

$0.87 per machine hour