The standard number of hours that should have been worked for the output attained is 8,000 direct labour hours and the actual number of direct labour hours worked was 8,400 . If the direct labour price variance was $8,400 unfavourable, and the standard rate of pay was $18 per direct labour hour, what was the actual rate of pay for direct labour? a. $17.00 per direct labour hour b. $19.00 per direct labour hour c. $15.00 per direct labour hour d. $18.00 per direct labour hour