The standard labour requirement of a product is, 10 Category I workers and 20 Category II workers at the rate of OMR 10 per hour and OMR 5 per hour respectively. During a 35 hours week actual labour used are: 8 Category I employees at the rate of OMR 11.5 per hour and 25 Category Il employees at the rate of OMR 4 per hour. Determine the Revised Standard Hour for Category I employees. a. 318 hours b. 770 hours c. 400 hours d. 385 hours