Apple stock recently closed at a price of $500 per share. andy's mom bought apple stock in 1980 at a price of $100 per share. what is the percentage of change in apple shares since 1980?

For this case what we can do is the following rule of three to solve the problem:
 100 $ > 100%
 $ 500 > x
 Clearing the value of x we have:
 x = (500/100) * (100)
 x = 500%
 
 the percentage of change in Apple shares since 1980 is:
 x = 500%

I’m sorry i can’t u