We look at the division of 54549 by 99 
The aim is to understand the frequency of 99 in 54549.

Step 1:
99 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Grab the next digit (4) from the dividend, add it to 5, then carry on: 54 / 99

On to step 2:
99 can be fit into 54 0 times, resulting in a remainder of 54.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 54, we get 54.
Take the next digit (5) from the dividend and append it to 54, then repeat: 545 / 99

On to step 3:
The number 99 fits into 545 5 times, leaving a remainder of 50.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
Subtract 495 from 545 to get 50.
Bring next digit (4) of the dividend behind the 50 and repeat the process: 504 / 99

Step 4:
99 can be fit into 504 5 times, resulting in a remainder of 9.
Write down 5 as next digit of the result. 
Result so far: 55.0
Subtracting 495 from 504 leaves us with 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 99

Let's proceed to step 5:
When dividing 99 by 99, we get 1 with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 551.0
If we subtract 99 from 99, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 6:
The number 99 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 551.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 7:
0 divided by 99 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 551.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 551.0, with a leftover of 0.0.