Chained Payment: Secondary receiver pays PayPal fees

1. How to set up to let Secondary Receiver pays PayPal fees? For chained payment.

2. Let's assume "the Secondary Receive paying PayPal fee" is already setup, how much money will each party get?

Assuming:
The order total is $100
MarketPress Service fee to collect is 1%
PayPal transaction fee is 3%
(You may ask, supper-admin of WPMU MP is losing money, since he is paying 3% PayPal fee, but only collect 1% from the sublog store owners. Yes, you are absolutely right. But don't worry about it since there is another way the super-admin can make back the lost.)

Is the following number right?

Sub blog store owner will see 2 lines of transactions in PayPal record:
Receive: $100 from PayPal
Pay: $1 (1% of total) to super admin

super admin will see 2 lines of transactions in PayPal record:
Receive: $1 from sub blog store owner
Pay: PayPal fee $3 (3% of total)

Are those number right?

Thanks for your time to read my questions!