Question

http://gyazo.com/5a3c21c603ec137dca4dbe79d929ccad

Answer 1

I = prt

interest = principal * rate * time
You are looking for the rate.

\(r = \dfrac{I}{pt} \)

Divide the interest by the product of the principal and the time.
Then multiply by 100 to change into a percent.

Answer 2

then its c

Answer 3

4.5%, C.
You are correct.