What is binary equivalent of the octal number 13.54?

Invalid octal number.

* * * * *

No, it is not an invalid octal.

13.54, in decimal form is 1*81+ 3*80+ 5*8-1+ 4*8-2 = 8+35/8+4/64

= 14.687510.

In binary, that is 1110.1011