Gumchara Corporation reported the following information with respect to the materials required to manufacture amalgam florostats during the current month:

Standard price per gram of materials . . . . . . . . . . . . . . . . . . . . . . . . $1.25

Standard quantity of materials per amalgam florostat . . . . . . . . . . . 4 grams

Actual materials purchased and used in production . . . . . . . . . . 2,800 grams

Actual amalgam florostats produced during the month . . . . . . . . . . 520 units

Actual cost of materials purchased . . . . . . . . . . . . . . . . . . . . . . . . . . $3,920

Normal monthly output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 550 units

a. Determine Gumchara’s materials price variance.

b. Determine Gumchara’s materials quantity variance.

c. Will Gumchara’s overhead volume variance be favorable or unfavorable? Why?