Assume, purely for calculation practice, that one dinar is valued at 12 dirhams under the relevant valuation. This is an illustrative rate, not a fixed historical exchange rate.
Admission: 100 dirhams
Exception: one dinar, hypothetically worth 12 dirhams
Remainder: 88 dirhams
If the relevant hypothetical value is 15 dirhams, the remainder becomes 85. The essential operation is to deduct value, not to subtract the bare number one.
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Calculating the dinar exception
Kitab al-Iqrar: Connected Exceptions, Quantities, and Cross-Category Exceptions
Assume, purely for calculation practice, that one dinar is valued at 12 dirhams under the relevant valuation. This is an illustrative rate, not a fixed historical exchange rate.
Admission: 100 dirhams
Exception: one dinar, hypothetically worth 12 dirhams
Remainder: 88 dirhams
If the relevant hypothetical value is 15 dirhams, the remainder becomes 85. The essential operation is to deduct value, not to subtract the bare number one.