1. For 984 and 599, Find BCD Subtraction using 10's complement

Solution:
`984-599` BCD subtraction using `10's` complement

Steps for BCD subtraction using `10's` complement

For `A-B`

1. Take `10's` complement for B

2. Add it to A using BCD addition
3. If addition is invalid BCD then add 6
4. If carry then add it to the next bits
5. In final result, if carry is occured then it is ignored and if
there is no any carry over, then take `10's` complement of the result and it is negative.

1. Take `10's` complement for `599`


Note : 10's complement of a number is 1 added to it's 9's complement number.

Step-1: 9's complement of 599 is obtained by subtracting each digit from 9

	9	9	9
-	5	9	9
	4	0	0

Step-2: Now add 1 to the 9's complement to obtain the 10's complement :
400 + 1 = 401
2. Add `984` and `401` using BCD addition

BCD code for 984 :	1001	1000	0100
BCD code for 401 :	0100	0000	0001
Addition :	1101	1000	0101
If Invalid BCD then add 6 :	0110
Addition :	10011	1000	0101
BCD value :	13	8	5

The left most bit of the result is 1, called carry and it is ignored.
So final answer of BCD Subtraction is `385`