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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?

HDss
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  • Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. – Community Jan 06 '23 at 15:35
  • Hint: $\frac{102}{100}=1.02=1+0.02$. – Karl Jan 06 '23 at 15:43

1 Answers1

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You can use: $\frac{new - old}{old}\times100\%$

$\frac{1802.41 -1800}{1800}\times100\% = 0.13389\%$

Kamal Saleh
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Jasper Rou
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  • Oh cool! Thanks! simple and interesting! Did you use some method to interpret what you needed or was that formula already known? – HDss Jan 06 '23 at 16:04
  • It is a pretty well known formula. https://www.cuemath.com/percentage-increase-formula/ – Jasper Rou Jan 09 '23 at 10:22