Question: Suppose that you are purchasing shelving units. The department has planned for units that are 6 shelves high, and each shelf is to be 36 inches wide and have 33 inches of actual filing space. From a sampling of records in the current files, you have determined that the average thickness of each record is 2 inches. The average discharge rate is 3,000 per year, and you are planning to store 10 years' worth of records. How many shelving units would you need to purchase? Select one: a. 198 b. 252 c. 303 d. 290