Your equal payments will be split based off of the balance remaining from your initial deposit and fees.
An example breakdown of this can be found below:
A Party Package of $120 at checkout will be $124.99 after fees. If a deposit of $20 is available, you can pay your first balance of $24.99 and have your remaining balance split like so:
Payment #1: (Deposit - $24.99)
Payment #2: $25.00
Payment #3: $25.00
Payment #4: $25.00