Equations: I = PRT and MV = P (1+ RT)

1. Find the simple interest on a $500 loan at 7% for 18 months.
2. Find the simple interest on a $2500 loan at 6% for 36 months.
3. Simple interest in the amount of $53.40 is earned for $890 invested for nine months. What was the simple interest rate?
4. Simple interest in the amount of $1500 is earned for a $6000 investment for 20 months. What was the simple interest rate?
5. How long will it take to earn $350 interest on a $2000 investment at a 5% interest rate?
6. How long will it take to earn $1600 interest on a $8000 investment at a 8% interest rate?

7. Find the maturity value on a loan of $1620 at 8% simple interest for nine months.

8. Find the maturity value on a loan of $4560 at 7% simple interest for eighteen months.

9. What is the ordinary interest on a loan for 60 days at 6% if the principal is $570.80?

10. Find the exact interest on $675 at 10 14% from March 28 to July 3.