How splitting works
We split the bill total (minus fixed sponsors’ advances) evenly across participants and extra sponsors. Guests owe ¥0. The “amount to split” can include extra sponsor add-ons for display; cash toward the bill should still match the bill total. The treasurer’s payment toward the bill is auto-filled.
Member roles and input
Participants: Pay full bill or Pay remainder. Guests: ¥0. Fixed sponsors: enter what they advanced. Extra sponsors: enter only the extra amount; their burden = split share + extra.