The term 2/10, n/30 is a typical credit term and means the following:
"2" shows the discount percentage offered by the seller.
"10" indicates the number of days (from the invoice date) within which the buyer should pay the invoice in order to receive the discount.
"n/30" states that if the buyer does not pay the (full) invoice amount within the 10 days to qualify for the discount, then the net amount is due within 30 days after the sales invoice date