Thomas Company uses a standard cost system and recognizes the materials purchase price variance at the time materials are purchased. Information for raw materials for Product RBI for the month of October follows:

Standard unit price

$1.80

Actual purchase price per unit

$1.65

Actual quantity purchased

4,000

units

Actual quantity used

3,900

units

Standard quantity allowed for actual production

3,800

units

What is the materials quantity variance?