An employee in Australia works for 8 hours per day and is exposed to the following sound pressure levels for the following percentage of time 20% of the working day at 100 dB(A) 40% of the working day at 70 dB(A) 20% of the working day at 72 dB(A) 20% of the working day at 58 dB(A) Using the Australian criteria for occupational noise exposure, calculate the following Equivalent 8 hour noise level = Number dB(A), 8 hours The time in hours that the employee is allowed to work at this sound level Number accurate to within of 0.2hrs 1 Sound Exposure Number hours [Enter a decimal value. Answers must be Pa2 h (Answers must be accurate to within 0.1]