Stone Lamps Company Produces Lamps with Granite Bases

Stone Lamps Company produces lamps with granite bases. The standard material cost for the granite used in each lamp is $20 per square metre. Each lamp requires 2 square metres of granite. In November, the company produced 500 lamps. There were 1,150 square metres of granite used during the month. The granite used had an actual cost $22 per square metre. What was the materials efficiency (quantity) variance in November for granite?

A) $3,000 favourable
B) $3,000 unfavourable
C) $3,300 favourable
D) $3,300 unfavourable