“This identified roll contains 12 cubits, at 100 rupees per cubit, totaling 1,200” supplies both a quantity and an aggregate price.
“Every cubit of this roll is 100; we will find out the total later” raises the original uncertainty addressed in the clause.
Specifying a unit rate is not equivalent to specifying the total length.
Opening interactive controls...
Kitab al-Buyu: Grain Sales, Bulk Heaps, Qafiz and Unit Prices
“This identified roll contains 12 cubits, at 100 rupees per cubit, totaling 1,200” supplies both a quantity and an aggregate price.
“Every cubit of this roll is 100; we will find out the total later” raises the original uncertainty addressed in the clause.
Specifying a unit rate is not equivalent to specifying the total length.