Keep the debt at 900 and the original’s relevant value at 600. If the remaining increase is worth 600, rather than 300, at redemption, the combined value is 1,200.
Original share = 900 × 600 ÷ 1,200 = 450.
Increase share = 900 × 600 ÷ 1,200 = 450.
The allocation changes because the increase is valued at redemption while the original’s fixed reference value remains that at delivery.
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Changing the value of the surviving increase
Kitab al-Rahn: Storage Costs, Growth and Additional Collateral
Keep the debt at 900 and the original’s relevant value at 600. If the remaining increase is worth 600, rather than 300, at redemption, the combined value is 1,200.
Original share = 900 × 600 ÷ 1,200 = 450.
Increase share = 900 × 600 ÷ 1,200 = 450.
The allocation changes because the increase is valued at redemption while the original’s fixed reference value remains that at delivery.