Bilkins Financial Advisors provides accounting and finance assistance to customers in the retail business. They have 4 professionals on staff, plus an office with 6 clerical staff. Total compensation, including benefits, for the professional staff runs about $576,000 per year, and they normally have about 8,000 billable hours per year. Professional staff keep detailed time sheets distributed by client number. Office and administrative costs total $754,000 a year. What is the cost allocation rate that Bilkins will use for office and administrative costs?