Acouple bought some stock for $30 per share that pays an annual dividend of $0.90 per share. after 1 year the price of the stock was $33. find the simple interest rate on the growth of their investment.

The simple interest rate will be found as follows:
A=Pe^(rt)
where:
A=$33
P=(30+0.9)=$30.9
t=1 year
plugging into our formula we get:
33=30.9e^(r*1)
33=30.9e^r
1.067961=e^r
introducing natural logs we get
r=ln 1.06761
r~0.06575
0.06575 or 6.575%