[General] on cash purchases / in cash payment

[maoyueh]

Are the sentences below natural? Thank you.

1. You can have/get a 20% discount on cash purchases.
2. You can have/get a 20% discount in cash payment.

 

[Rover_KE]

#1 is natural.

#2 would be OK if you changed 'in' to 'for' and deleted 'payment'.

Also 'You can have/get 20% off for cash'.