Convert the following octal numbers to decimal:

(a) 257

(b) 3527

(c) 123

(d) 605.12

Convert the following binary numbers to hexadecimal:

(a) 1010110110111

(b) 10110111011011

(c) 0110101100

Convert the following hexadecimal numbers to binary:

(a) A6

(b) A07

(c) 7AB4

Convert the following hexadecimal numbers to binary:

(a) 23D

(b) BC9

(c) 9BC8