help problem

Realized yield: Trevor Price bought 10-year bonds issued by Harvest Foods five years ago for $936.05. The bonds make semiannual coupon payments at a rate of 8.4 percent. If the current price of the bonds is $1,048.77, what is the yield that Trevor would earn by selling the bonds today?

I need to be able to show my calculations on this problem.  I bought this already and the person gave me the wrong information as once I input the information into his spreadsheet I got the answer of 10.25% and this is wrong.  I need help to solve this problem within one hour.

 
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