The credit term $2/10,$ n$/30$ means

if paid within $30$ days of the delivery date, the net amount is due.

if paid within $10$ days of the invoice date, the buyer may deduct $2\%$ from the

net amount.

if paid within $10$ days of the delivery date, the buyer may deduct $2\%$ from the

net amount.

if paid within $30$ days of the invoice date, the buyer may deduct $2\%$ from the net amount.