Without a microphone, a certain singer in the concert hall produces 67 dB. With a microphone, this increases to 79.5 dB. - a) The sound intensity with the microphone is how many times the previous (unmiked) intensity? Round your answer to the nearest 0.1. - b) How many times as loud does the singer sound to the audience when using a micrphone compared to without one? Round your answer to the nearest 0.1