Rebate & Rebate kind

Hi to all !

how do we configure rebate and rebate in kind in SAP pricing.....as follows

Rebate

customer buys 20 pieces @10$ with 5% discount say is 190$ and get 20 pieces

Rebate in Kind

20 pieces @10$ with out paying 10% discount say 200$ gets 22 pieces (10+1)

how do we configure these 2 scenarios in pricing in SAP