Assume a debt of 900, an original worth 600 when delivered as security and surviving growth worth 300 when released; the original itself has perished.
Combined relevant value = 600 + 300 = 900.
Original share = 900 × 600 ÷ 900 = 600, which falls from the debt.
Increase share = 900 × 300 ÷ 900 = 300, payable to redeem the increase.
The amounts illustrate the classical allocation in numerical form; they are not a modern statutory determination.
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Worked calculation with whole numbers
Kitab al-Rahn: Storage Costs, Growth and Additional Collateral
Assume a debt of 900, an original worth 600 when delivered as security and surviving growth worth 300 when released; the original itself has perished.
Combined relevant value = 600 + 300 = 900.
Original share = 900 × 600 ÷ 900 = 600, which falls from the debt.
Increase share = 900 × 300 ÷ 900 = 300, payable to redeem the increase.
The amounts illustrate the classical allocation in numerical form; they are not a modern statutory determination.