I don’t understand which formula to use for it Marco Chip, Inc. just issued zero-coupon bonds with a par value of $1,000.

I don’t understand which formula to use for it Marco Chip, Inc. just issued zero-coupon bonds with a par value of $1,000.

 I need help answering this question. I don’t understand which formula to use for it
Marco Chip, Inc. just issued zero-coupon bonds with a par value of $1,000. The bond has a maturity of 28 years and a yield to maturity of 14.71 percent, compounded semi-annually. Please assist.
 
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