The cashback gap between options is not a discount: it is the price of payment float and pledged capital. This is the same calculation behind the proposal.
Average financed balanceR$2,169,86322 days of financing on R$36,000,000 a year
Value of the float at CDIR$301,611per year, at a CDI of 13.90% p.a.
Extra cashback on option 3R$540,000per year, above option 1
The 22 days of float in option 1 finance an average balance of R$2,169,863 — at CDI, R$301,611 a year. Option 3 keeps one day of float (D-1), so it gives up R$287,901 of that value for R$540,000 in extra cashback; option 2 preserves it by asking for R$3,000,000 in pledged capital. The R$252,099 a year goes to whoever gives up the float — provided the cash position can absorb D-1 debit.
Option comparison