Sarah investments in stock grew 28% to $640.how much did she invest?

Question

what will the answer be for this problem 

Answer 1

So, Chantel, if something grows 28%, now it's at 128%, right?

 

1.28s = 640

s = 500

 

Hope this helps!

Answer 2

s represents her investment

0.28s represents growth

 

s + 0.28s = 640

 

Can you solve for s?

Answer 3

Chantel,

 

Let X = initial investment

 

It grew 28%

Express this as a growth factor 1.28

 

1.28X = 640

X = $500