Answer:
Standard labour rate = $19.6 (unfavourable).
Step-by-step explanation:
The labour cost variance can be calculated as below:
Variance = Actual cost - Standard cost
= Actual labour rate x Actual hour of labour - Standard labour rate x Actual hour of labour
Putting all the number together, we get:
880 = 17.5 x 420 - Standard labour rate x 420. Solve the equation, we get: Standard labour rate = 19.6 (unfavourable)