Please explain how to solve this question on BA II Plus Calculator.

Thanks.

Corey purchased a $8,500 bond that was paying a 5.25\% compounded semi-annually coupon rate and had 7 more years to maturity. The yield rate at the time of purchase was 4.00% compounded semi-annually. a. How much did Corey pay for the bond? Round to the nearest cent b. What was the amount of premium or discount on the bond? amount is (x) Round to the nearest cent