5-18 Alternative allocation bases for a professional services firm. The Walliston Group (WG) provides tax advice to multinational firms. WG charges clients for (a) direct professional time (at an hourly rate) and (b) support services (at 30% of the direct professional costs billed). The three professionals in WG and their rates per professional hour are as follows: Professional Billing Rate per Hour Max Walliston $640 Alexa Boutin 220 100 Jacob Abbington WG has just prepared the May 2011 bills for two clients. The hours of professional time spent on each client are as follows: Hours per Client Professional San Antonio Dominion Amsterdam Enterprises Walliston Boutin 26 4 5 14 Abbington Total 39 70 70 1. What amounts did WG bill to San Antonio Dominion and Amsterdam Enterprises for May 2011? 2. Suppose support services were billed at $75 per professional labor-hour (instead of 30% of profes- sional labor costs). How would this change affect the amounts WG billed to the two clients for May 2011? Comment on the differences between the amounts billed in requirements 1 and 2. 3. How would you determine whether professional labor costs or professional labor-hours is the more appropriate allocation base for WG's support services?