Why two hexadecimal digit can only stand 8 bits in MAC address

 A hexadecimal digit can have sixteen different values, 0..9 and A..F, representing 0..15 in decimal.

For the same value in binary you need four bits, 0000..1111, representing the same 2⁴ values. Two of those four-bit nibbles or hexadecimal digits form a byte, representing 16*16 = 256 values.

48 bits or six bytes require 12 hex digits, often written with - or : in between (byte) pairs.

https://networkengineering.stackexchange.com/questions/53659/why-two-hexadecimal-digit-can-only-stand-8-bits-in-mac-address

Hexadecimal to Decimal conversion table

Hexadecimal	Decimal
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
A	10
B	11
C	12
D	13
E	14
F	15

https://www.w3resource.com/convert/number/hex-to-decimal.php

https://decimaltobinary.pro/How-to-Convert_hexadecimal__9F_in_decimal_%3F

(9F)16 = (159)10

Step by step solution

Step 1: Write down the hexadecimal number:

(9F)16

Step 2: Show each digit place as an increasing power of 16:

9x161 + Fx160

Step 3: Convert each hexadecimal digits values to decimal values then perform the math:

9x16 + 15x1 = (159)10

So, the number 159 is the decimal equivalent of hexadecimal number 9F (Answer).