Can you explain this general accounting question using accurate calculation methods?

America Manufacturing has determined a standard direct material cost per unit of $9.20 (4 pounds at $2.30 per pound). Last month, America purchased and used 8,500 pounds of direct materials, for which it paid $18,700. The company produced and sold 2,100 units during the month. Calculate the direct materials price variance, direct materials quantity variance, and direct materials spending variance