Please explain how you got these on financial calculator.

A perpetual bond with a par value of $1,000 and a coupon rate of 7.50% (semiannual coupon) has a yield to maturity of 5.50%. What is its current yield? 0.00% 5.75% 5.78% 5.50% 5.62% A perpetual bond with a par value of $1,000 and a coupon rate of 8.25% (semiannual coupon) has a current market price of $935. What is its yield to maturity? 9.16% 9.40% 8.26% 8.82% 9.21%