We're dividing 78562050 by 521 
The aim is to understand the frequency of 521 in 78562050.

Step 1:
521 can be fit into 7 0 times, resulting in a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 521

Step 2:
521 can be fit into 78 0 times, resulting in a remainder of 78.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 78 after subtracting 0 from 78.
Append the next digit (5) from the dividend to 78 and continue with: 785 / 521

Advancing to step 3:
785 divided by 521 is 1 with a remainder of 264.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 521 from 785 leaves us with 264.
Take the next digit (6) from the dividend and append it to 264, then repeat: 2646 / 521

Advancing to step 4:
2646 divided by 521 is 5 with a remainder of 41.
The next digit of our result is 5. 
Result so far: 15.0
If we subtract 2605 from 2646, we get 41.
Fetch the next digit (2) from the dividend, attach it to 41 and continue: 412 / 521

Moving on to step 5:
521 can be fit into 412 0 times, resulting in a remainder of 412.
Put 0 as the next digit of the answer. 
Result so far: 150.0
Deduct 0 from 412 and we're left with 412.
Fetch the next digit (0) from the dividend, attach it to 412 and continue: 4120 / 521

Step 6:
521 goes into 4120 7 times with a remainder of 473.
Put 7 as the next digit of the answer. 
Result so far: 1507.0
Subtracting 3647 from 4120 leaves us with 473.
Append the next digit (5) from the dividend to 473 and continue with: 4735 / 521

Step 7:
The number 521 fits into 4735 9 times, leaving a remainder of 46.
Use 9 as the next digit of our solution. 
Result so far: 15079.0
The remainder is 46 after subtracting 4689 from 4735.
Append the next digit (0) from the dividend to 46 and continue with: 460 / 521

Let's proceed to step 8:
521 can be fit into 460 0 times, resulting in a remainder of 460.
Write down 0 as next digit of the result. 
Result so far: 150790.0
If we take 0 away from 460, we end up with 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

Advancing to step 9:
The number 521 fits into 4600 8 times, leaving a remainder of 432.
Put 8 as the next digit of the answer. 
Result so far: 150790.8
The remainder is 432 after subtracting 4168 from 4600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4320, and continue the process.

Going ahead to step 10:
521 goes into 4320 8 times with a remainder of 152.
Write down 8 as next digit of the result. 
Result so far: 150790.88
If we take 4168 away from 4320, we end up with 152.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1520, and continue the process.

The final outcome is 150790.88, with a leftover of 0.152.