How do I figure this out???

Question

A loud speaker has an output of 80db. If the volume of the sound is turned up so that the output intensity is 10,000 times greater, what is the new sound intensity level

Answer 1

Increasing the level by 1 Bel, or 10 dB, increases the intensity by a factor of 10. The scale is logarithmic, so:
+20 dB = 100x
+30 dB = 1,000x
+40 dB = 10,000x
So ADDING 40 dB to your starting number MULTIPLIES the intensity level by 10,000. (By the way, 120 dB of sound can cause pain and permanent hearing loss.) Have fun!

Answer 2

120 db (?)