Casey’s Photography expected to work 400 hours per year taking wedding photos for 50 weddings. Casey’s standard labour rate for photographers is $25 per hour. During the last year, Casey actually worked 420 hours for 50 weddings and paid photographers $10,815. The labour rate and labour efficiency variances are:

a. $315 favourable; $500 favourable

b. $815 favourable; $500 unfavourable

c. $315 favourable; $815 favourable

d. $315 unfavourable; $500 unfavourable