please help me solve these 3 problems

Cobton Co. has a standard of 1.5 pounds of materials per unit, at $6 per pound. In producing 2,000 units, Cobton Co.'s used 3,100 pounds of materials at a total cost of $17,980. Cobton Co.'s materials price variance is Select one: A. $200 U. B. $420 F. C. $600F D. $620 F. E. None of the above. Cobton Co.'s has a standard of 1.5 pounds of materials per unit, at $6 per pound. In producing 2,000 units, Cobton Co.'s used 3,100 pounds of materials at a total cost of $17.980. Cobton Co.'s materials quantity variance is Select one: A. $20 F. B. $6,200 U. C. $600 U. . D. $4,200 U. E. None of the above. Cobton Co.'s has a standard of 2 hours of labor por unit, at $10 per hour. In producing 2,000 units, Cobton Co's used 3,850 hours of labor at a total cost of $70,455. Cobton Co.'s labor price variance is Select one: A $1,545 U B. $1,200 U. . C. $1,155 U D. $2,895 F. E. None of the above