Answer:
(a) rate variance = $ 5,234, Adverse
(b) time variance = $ 6,360, Favourable
(c) total cost variance = $1,126, Favourable
Explanation:
(a) rate variance,
rate variance = (Standard Rate - Actual Rate) × Actual Hours
           =( $12.00- $12.20) × 26,170 hours
           = $ 5,234, Adverse
(b) time variance, and
time variance = (Standard Hours - Actual Hours) × Standard Rate
            = (26,700 hours - 26,170 hours) ×  $12.00
           = $ 6,360, Favourable
(c) total cost variance
total cost variance = rate variance + time variance
                = $ 5,234, Adverse + $ 6,360, Favourable
                = $1,126, Favourable