Are you talking USDA CFAP calculation? If so......

Jan 15th unsold inventory= 10,000 bu.
2019 Total production= 30,000 bu.
30,000 X 50%= 15,000 bu. (Take the lesser of the two which is your unsold inventory at 10,000 bu. and have to use that)

1) 10,000 X 50% (USDA payment factor) = 5000 bu.
2) 5000 bu. X .67 (CARES Act + CCC payment rate together) = $3350
3) $3350 X 80% ( Payment you get up front) = $2680 payment

Clear as mud ??????