Flexi Says:
To calculate a 1000% increase, think about what the new value is compared to the old value.
Set the original value as 100%.
An increase of 1000% will make the new value 100% + 1000% = 1100% of the original value.
Then multiply the original value by 11. i.e.
@$$\begin{align*}\text{Original Value} \times 11 = \text{Increased Value}\end{align*}@$$
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