The first calculation entails deducting the cost of the T-bill from 100 and dividing the resulting sum by the cost.
Duration of bond portfolio (Dp) = 10
Value of bond portfolio (Vp) = 4,000,000
Duration of bonds (Df) = 11
T-bonds to be sold = Dp × Vp / Df
T-bonds to be sold = 10 × 4,000,000 / 11
T-bonds to be sold = $3,636,363.
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