A credit sales os $750 is made on June 13,terms2/7,n/30,on which a return of $50is granted on 16 June.the customerpaid the amount owing on 17 June.what amount did yhe customer pay?

Please do not tag onto other people's threads. Things would get a little messy if everyone did that. (And your question is in no way related to that thread.) Also, one posting of the question will suffice. I've moved your question to its own thread.

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