C-1 is incorrect. May I please receive the answer for C-1

The Plonger Petroleum Corporation has a bond outstanding with an $70 annual Interest payment, a market price of $860, and a maturity date in four years. Assume the par value of the bond is $1,000 And the following: (Use the approximation formula to compute the approximate yield to maturity and use a calculator or Excelto compute the exact yteld to maturity. Do not round Intermediate calculations. Input your answers as a percent rounded to 2 decimal places.) a Coupon rate b. Current yield -1. Approximate yield to maturity c2 Exact yield to maturity 7.00% 8.14% 11.30% 11.57%