1. The problem statement, all variables and given/known data At a rock concert, the engineer decides that the music isn't loud enough. He turns up the amplifiers so that the amplitude of the sound, where you're sitting, increases by 87.0%. By what percentage does the intensity increase? Do not enter unit. 2. Relevant equations I used the fact that intensity is proportional to amplitude squared. (A2/A1)^2 = I2/I1 3. The attempt at a solution 85% increase in A, so: (1.85)^2=I2/I1 3.4225=I2/I1 I2=3.4225I1 3.4225x100= 342% 342%-100% = 242% Answer=242 <-- which is incorrect. where did I make my mistake?