We have been given that at the start of a year, company XYZ's stock is $40 per share. At the end, the company's stock is $60 per share. We are asked to find the percent increase.
We will use percent increase formula to solve our given problem.
![\text{Percent increase}=\frac{\text{Final}-\text{Initial}}{\text{Initial}}* 100\%](https://img.qammunity.org/2021/formulas/mathematics/middle-school/3l4m5tdvlqaxj63xxdqot1pqbraedymage.png)
![\text{Percent increase}=(60-40)/(40)* 100\%](https://img.qammunity.org/2021/formulas/mathematics/college/rldr8gx0fqz0q0c7fq7wy1f380yx1s9yaw.png)
![\text{Percent increase}=(20)/(40)* 100\%](https://img.qammunity.org/2021/formulas/mathematics/college/si6fbpcp3mgwjq59wqnbq9gtqit3jhk9e3.png)
![\text{Percent increase}=0.5* 100\%](https://img.qammunity.org/2021/formulas/mathematics/college/hf7y1msbgbh35mzrxjsv054ih33j4yhsc1.png)
![\text{Percent increase}=50\%](https://img.qammunity.org/2021/formulas/mathematics/college/vn74tgjltad9b77kdxgjzmtwm8mrz7vv8f.png)
Therefore, the stock price's rate of return was 50%.