how to calculate 10% above and 10 % below a number? [closed]

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let say i have a number 10 how can i find number which is 10 % above and 10 % below this number.how do i calculate i am reading about %.please tell how to find it

how to calculate 10 % increase and % below of the number.lets say the Number is 10
i am new to percentage thing need help.please tell me the formula how to do it !!

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3 Answers

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When you say “$10\%$ above $n$,” it is the number $n+ \frac{10}{100}\times n=1.1\times n$ (note that $\frac{10}{100}\times n$ is $10\%$ of $n$). Similarly, $10\%$ below $n$ is $n-\frac{10}{100}\times n=0.9\times n$.

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To calculate a $10$% increase, multiply by $1.1$ ($110$%). To calculate a $10$% decrease, multiply by $.9$ ($90$%).

The makes sense. If you want to add $10$% you multiply by $1+\frac{1}{10}$. If you want to subtract $10$% you multiply by $1-\frac{1}{10}$.

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First, calculate $10$% of $10$. This is $0.10(10) = 1$. So, $10$% of $10$ is $1$.

Now, $10%$ above $10$ is just $10 + 1 = 11$. And $10$% below $10$ is just $10 - 1 = 9$.

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