Yield-To-Maturity = [C + (F - P / n)] ÷ [F+P/2]
Where:
C - coupon or interest payment per annum
F - Face Value or par value
P - price
n - Years to Maturity
I used the above formula for manual computation. There is also an online yield to maturity calculator and it confirmed the answer solved manually. The Yield to Maturity is 8.124%