An account earns simple annual interest. (a) Find the balance of account. Find the interest earned. find the balance of the account. $5000 at 4.5% for 6 months
$200 at 15% for 5 years

Find the annual interest rate.
4. I = $30, P = $150, t = 2 years
5. I = $60, P = $500, t = 18 months
6. I = $150, P = $3000, t = 4 years

Find the amount of time.
7. I = $42, P = $800, r = 3%
8. I = $2000, P = $5000, r = 8%
9. I = $595, P = $14,000, r = 8.5%