Duffy and Rowe is a full-service legal firm. during the year corporate clients required 5000 hours of legal service, whereas individuals required 3000 hour.in the past, the firm has assigned overhead to client engagements based on direct labor hours. However, Duffy suspects that legal services to corporate clients drive firm overhead more than legal services to individuals and believes that adopting activity-based costing will allow a more accurate allocation of cost to various clients. The firm's revenues and costs for the year are as follows: