Memorial Heart Hospital provides angioplasty procedures to patients according to the following standards.

Standard Quantity or Hours Standard Price or Rate Direct materials (stents) 2.00 stents per procedure $1,240 per stent Direct labor (cardiologist) 2.00 hours per procedure $220 per hour

For the most recent year, the hospital reported the following actual data:

Number of procedures performed 35 Number of stents purchased and used 68 Total cost of stents purchased and used $82,400 Number of direct labor hours 67 Total cost of direct labor $14,100

Compute the materials quantity variance.