Please answer with detail working with formula

For the current year Foxborough Corp. budgeted to produce and sell 20,000 units. Foxborough's actually produced and sold 18,000 units. Other relevant data includes:

Direct Materials (all materials purchased were used):

Budgeted cost: $14.00 per pound.

Standard material allowed: 2.3 pounds per unit.

Actual materials cost $16.00 per pound for a total cost of $608,000.

Direct Manufacturing Labor:

Standard cost is 0.3 hours per unit at $34.00 per hour.

Actual labor hours used were 6,300 at a price of $32.50 per hour.

a. Calculate the direct materials price, efficiency, and flexible budget variances.

b. Give a possible cause or driver of the materials efficiency variance. Be specific.

c. Calculate the direct labor price, efficiency, and flexible budget variances.