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Nothing here is saved. Close the app and the numbers are gone - it is a scratch pad, not a record.
Bags x bag size fills the quantity for you. Then any two of rate, quantity and total give the third. Anything the app worked out is shown like this.
Filled in from sections 1 and 3. Type over either one if it is different - for instance if the smalls came back in their own sacks.
Whatever is left over after the three grades above.