What is 0.0001?
0.0001
Multiply the above by 10, you get 0.001, now multiply 0.001 by
10 and you get 0.01, now multiply 0.01 by 10 and you get 0.1, now
multiply 0.1 by 10 and you get 1
So to get from 0.0001 to 1, you had to multiply it by 10 4
times, that is you had to multiply 0.0001 by 10000 to get 1, but if
you multiply a number by 10000, you have to divide it also by the
same number to retain the original value
Hence 0.0001 is the same as 1/10000