The Geurtz Company uses standard costing. The company makes and sells a single product called a Roff. The following data are for the month of August:

' Actual cost of direct material purchased and used: $88,400
' Material price variance: $3,400 unfavorable
' Total materials variance: $23,900 unfavorable
' Standard cost per pound of material: $5
' Standard cost per direct labor-hour: $5
' Actual direct labor-hours: 8,100 hours
' Labor efficiency variance: $2,500 favorable
' Standard number of direct labor-hours per unit of Roff: 2 hours
' Total labor variance: $1,550 unfavorable
The total number of units of Roff produced during August was:
1 .3,800

4,300
4,100
4,050