A.C. Tech Manufacturing Appliances manufactures three sizes of kitchen appliances: small, medium, and large. Product information is provided below.

	Small	Medium	Large
Unit selling price	$410	$600	$1,220
Unit costs:
Variable manufacturing	(240)	(310)	(510)
Fixed manufacturing	(80)	(140)	(260)
Fixed selling and administrative	(80)	(85)	(170)
Unit profit	$10	$65	$280
Demand in units	140	130	140
Machinehours per unit	50	50	140

The maximum machinehours available are 6,500 per week.

What is the contribution margin per machinehour for a medium appliance?