Intel Corporation manufactures computer processors. The standard cost to produce one processor is as follows:

• Direct materials: $30
• Direct labor: 2 hours at $25 per hour
• Variable overhead: $10

During the month, 10,000 processors were produced. Actual costs incurred were as follows:

• Direct materials: $320,000
• Direct labor: 20,500 hours at an average rate of $26 per hour
• Variable overhead: $105,000

Calculate:

a) Direct material price variance and quantity variance.

b) Direct labor rate variance and efficiency variance.

c) Variable overhead spending variance and efficiency variance.