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# Solve the following percentage problem. Between $2000$ and $2015$, the number of twin births in the United States increased by $13 \%$, to approximately $135,000$. About how many twin births were there in $2000$?

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With the increase of 13%, we use the rule

\begin{aligned} (100+P)\%&=(100+13)\%\\ &=113\% \end{aligned}

With this, we get the previous year as:

\begin{aligned} \text{No of Births 2015}&=\text{No of Births 2000}\times(100+P)\%\\ 135,000&=\text{No of Births 2000}\times113\%\\ \frac{135,000}{113\%}&=\text{No of Births 2000}\\ \text{No of Births 2000}&=119,469.0265 \end{aligned}

Hence, there are around 119,469 to 119,470 twin births in US in 2000.

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