The data below relate to the month of April for Monroe, Inc., which uses a standard cost system and a two-variance analysis of factory overhead:

Actual direct labor hours used	16,500
Standard direct labor hours allowed	16,250
Actual total factory overhead	$53,200
Budgeted fixed factory overhead	$12,000
Budgeted activity in hours	16,000
Total overhead application rate per standard direct labor hour	$3.25
Variable overhead application rate per standard direct labor hour	$2.50

What was Monroe's production-volume variance for April?

a.	$187.50 favorable
b.	$187.50 unfavorable
c.	$437.50 favorable
d.	$437.50 unfavorable