Question about modifying percentage and calculating probability.

[Kiraz]

I’m writing a software which requires me to calculate percentages, modify them and probability.

For example, for two percentages; % 83.3 and % 80

The probability is:

(83.3 x 80) / 100 = % 66.6

If I modify this result by adding % 10 of it’s value it becomes: 66.6 + 6.66 = 73.26

Now the equation becomes:

(83.3 + 80) / 100 = % 73.26



My question is, how can I calculate the new percentages of % 83.3 and % 80 to fit the new result and keep correct ratio between them?

I am not even sure if it’s correct, but I tried modifying the probabilities by doing:

100 – 83.3 = 16.7, 100 – 80 = 20, 100 – 66.6 = 33.4

Added % 20 of this values to the main percentages:

(16.7 x 20) / 100 = 3.34 à 83.3 + 3.34 = 86.64

(20 x 20) / 100 = 4 à 80 + 4 = 84

(33.4 x 20) / 100 = 6.68 à 66.6 + 6.68 = 73.28

Probability becomes:

(86.64 x 84) / 100 = % 72.77

As can be seen 72.77 is not equal to 73.28

I’m sure there is a right way to do it, but I can’t seem to find it.

 

[stapel]

I’m writing a software which requires me to calculate percentages, modify them and probability.

For example, for two percentages; % 83.3 and % 80

Of what are these percentages?

The probability is:

(83.3 x 80) / 100 = % 66.6

"The probability" of what? How are you relating the percentages to the probability?

If I modify this result by adding % 10 of it’s value it becomes: 66.6 + 6.66 = 73.26

"Modify" what? How? Why? What is the "it" whose "value" you are computing?

Now the equation becomes:

(83.3 + 80) / 100 = % 73.26

"The equation" of what? Relating what to what? How?

My question is, how can I calculate the new percentages of % 83.3 and % 80 to fit the new result and keep correct ratio between them?

I am not even sure if it’s correct, but I tried modifying the probabilities by doing:

100 – 83.3 = 16.7, 100 – 80 = 20, 100 – 66.6 = 33.4

Added % 20 of this values to the main percentages:

(16.7 x 20) / 100 = 3.34 à 83.3 + 3.34 = 86.64

(20 x 20) / 100 = 4 à 80 + 4 = 84

(33.4 x 20) / 100 = 6.68 à 66.6 + 6.68 = 73.28

Probability becomes:

(86.64 x 84) / 100 = % 72.77

As can be seen 72.77 is not equal to 73.28

I’m sure there is a right way to do it, but I can’t seem to find it.

I'm sorry, but I can't make heads or tails of what you're trying to do...?

Please reply with the full and exact text of the exercise, project, or other type of task that you are attempting.

Thank you!

Eliz.

 

[Steven G]

I’m writing a software which requires me to calculate percentages, modify them and probability.

For example, for two percentages; % 83.3 and % 80

The probability is:

(83.3 x 80) / 100 = % 66.6

If I modify this result by adding % 10 of it’s value it becomes: 66.6 + 6.66 = 73.26

Now the equation becomes:

(83.3 + 80) / 100 = % 73.26



My question is, how can I calculate the new percentages of % 83.3 and % 80 to fit the new result and keep correct ratio between them?

I am not even sure if it’s correct, but I tried modifying the probabilities by doing:

100 – 83.3 = 16.7, 100 – 80 = 20, 100 – 66.6 = 33.4

Added % 20 of this values to the main percentages:

(16.7 x 20) / 100 = 3.34 à 83.3 + 3.34 = 86.64

(20 x 20) / 100 = 4 à 80 + 4 = 84

(33.4 x 20) / 100 = 6.68 à 66.6 + 6.68 = 73.28

Probability becomes:

(86.64 x 84) / 100 = % 72.77

As can be seen 72.77 is not equal to 73.28

I’m sure there is a right way to do it, but I can’t seem to find it.

(83.3 x 80) / 100 = % 66.6 can't be correct as 83.8x80 is much much larger than 66.6. I understand that you correctly replaced the division by 100 with the % sign but that doesn't negate the fact that 83.8x80 is much much larger than 66.6.

 

[Dr.Peterson]

For example, for two percentages; % 83.3 and % 80

As an aside, in English, the percent sign is always placed after the number, not before.

I had never seen it in this position, but according to Wikipedia, there are a few languages, notably Turkish, in which it is standard to put the sign before the number. You learn something new every day!

 

[Kiraz]

Thanks my friend.

 

[Kiraz]

As an aside, in English, the percent sign is always placed after the number, not before.

I had never seen it in this position, but according to Wikipedia, there are a few languages, notably Turkish, in which it is standard to put the sign before the number. You learn something new every day!

Yes, I am Turkish.