Assume (1) the quantity of materials purchased equals the quantity used in production, (2) the materials price variance is $400 unfavorable, and (3) the materials spending variance is $200 unfavorable. Given these assumptions, which of the following statements is true? Multiple Choice The materials quantity variance must be $600 favorable. The materials quantity variance must be $600 unfavorable. The materials quantity variance must be $200 favorable. The materials quantity variance must be $200 unfavorable.