David manufactures snowboards for aspiring Olympic athletes and estimates the following: Designing Drilling Total Department Department M m: mm David uses departmental overhead rates for his business. in the Designing Department. overhead is applied on the basis of direct labour hours. In the Drilling Department. overhead is applied on the basis of machine hours. Actual data for the month of June is as follows: Designing Drilling Total Department Department m-m Use the above information to answer the following questions