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The percent change is the increase or decrease in the value of a quantity. If the new value is larger than the original value then it is a percent increase and if the change in value is lesser than the original value it is called percentage decrease.

For example, if a person has 25 dollars and he gets 3 more dollars and now has 28 dollars, its percentage increase is calculated as shown:

$\begin{array}{l}\text{Increase}=28-25=3\\ \%\text{change=r,then}\\ \frac{3}{25}=\frac{r}{100}\\ r=\frac{3}{25}脳100\\ =12\%\end{array}$

We are given that the Current share price of a technology company is $135. And that it is a 16.2% increase over the past year.

$\frac{\text{Change}}{\text{Originalamount}}=\frac{r}{100}$

If we let x represent the price of each share a year ago, we can find it as follows:

localid="1642764148222" $\begin{array}{l}\text{Change:135-x}\\ \frac{135鈭�x}{\text{x}}=\frac{16.2}{100}\\ 100\left(135鈭�x\right)=16.2x\\ 13500鈭�100x=16.2x\\ 13500=16.2x+100x\\ 13500=116.2x\\ x=\frac{13500}{116.2}\\ x=116.18\end{array}$

Thus, the price of each share a year ago was $116.18.