The 130-decibel sound of a rock band is 1000 times more intense than the 100-decibel sound of a nearby subway train. The calculation is based on the sound intensity formula
I(db) = 10log(I/Io)
For the 130 Db
130=10log(I1/Io)
I1/Io =10^13
For the 100 Db
100=10log(I1/Io)
I2/Io =10^10
I1/Io/I2/Io=10^13/10^10^10
I1/I2=1000