In a binary coded decimal (BCD) system, 4 bits are used to represent a decimal digit from 0 to 9. For example, 3710 is written as 00110111BCD.
(a) Write 28910 in BCD
(b) Convert 100101010001BCD to decimal
(c) Convert 01101001BCD to binary
(d) Explain why BCD might be a useful way to represent numbers