A table has a mass of 500 kg. The floor is known to have a vibration amplitude of 1 micro-meter at a frequency of 200 Hz due to a motor in an adjoining room. What is the minimum natural frequency for a system to provide isolation? If a four-spring table suspension (undamped) is to be designed so that the response amplitude of the table is no larger than 1 percent of the input, what is the maximum natural frequency for the table system and the resulting individual spring stiffness?