Under the matched-maturity marginal cost of funds approach, an amortizing loan is conceptually broken down into a series of bullet loans matching each principal cash flow. Assuming equal principal repayments, a 6-year amortizing loan has 6 principal repayments of equal size (1/6 of the principal each year). Each cash flow is matched with funding of the same maturity.

The total uniform liquidity premium (R) applied to the outstanding balance of the loan must equal the sum of the costs of the individual match-funded pieces over their respective terms.

• Sum of outstanding balances over the 6 years (in terms of fractions of initial principal) = $6/6 + 5/6 + 4/6 + 3/6 + 2/6 + 1/6 = 21/6$
• Total cost of match-funded pieces over their lives = $(1 \times 6 + 2 \times 14 + 3 \times 18 + 4 \times 24 + 5 \times 27 + 6 \times 32) / 6 = (6 + 28 + 54 + 96 + 135 + 192) / 6 = 511 / 6$

Equating the two to solve for the uniform rate R: $R \times \frac{21}{6} = \frac{511}{6}$ $R = \frac{511}{21} \approx 24.333 \text{ bps}$

Therefore, the correct answer is D.