Example, I have 100 in the account and they give me an interest bonus of 2, that is, now I have 102 thanks to the interest they gave me. Is there a formula to know according to the amount they gave me? Here, because they are simple numbers, we can know that the percentage was 2%, that is, 0.02 * 100 I would like to know the percentage that was added to my account. I had an example of 1800 and they added 2.41 to have a total in my account of $1802.41
What mathematical formula can I use to find out what percentage that amount is based on the base amount, assuming interest was the same all the time?
You can use: $\frac{new - old}{old}\times100\%$
$\frac{1802.41 -1800}{1800}\times100\% = 0.13389\%$