3. You've just graduated from college and are about to start a new job. After finding an apartment and contacting the utility companies, you discover you need a total of $1,500 for all of your deposits. Your parents loan you the money and ask you to pay it back in 6 months with 4% simple interest. How much will you repay your parents at the end of the 6 months? Round your answer to the nearest cent if necessary.

4. You lend $800 to your brother and tell him that he must pay you back $852. What interest rate will your brother pay?