$82,708
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Coupon interest payment = $100,000 x .06 x 6/12 = $3,000
PV of annuity = $3,000 PMT x Table 4 factor (n = 30, I = 4%)(since compounded 2x/year)
PV of annuity = $3,000 x 17.29203 = $51,876
PV of face value = $100,000 FV x Table 2 factor (n = 30, I = 4%)
PV of face value = $100,000 x .30832 = $30,832
$51,876 + $30,832 = $82,708