Answer:
$841 approx
Step-by-step explanation:
Bonds refer to debt instruments whereby the issuer raises long term finance, agreeing to pay the lenders, a fixed rate of coupon payments at regular intervals and repayment of principal upon maturity.
The present value of a bond is represented as:

where
Present value of a bond
C = Annual coupon payments
k = yield to maturity/ cost of debt
n = years to maturity
RV = Redemption value
here, C = 1000 × 9% = $90
K = 11%
n = 20 years
RV = $1000
putting these values in the above equation, we have,

= 7.9633 × 90 + 0.124 × 1000
= 716.699 + 124.033
= $ 840.73 OR $ 841 approx.
Thus, the bond will sell at $841 today.