The credit terms $\frac{2}{10},\frac{n}{30}$ are interpreted as:

$30\%$ discount if paid within $2$ days

$2\%$ cash discount if the amount is paid within $10$ days, with the balance due in $30$ days

$30\%$ discount if paid within $10$ days

$10\%$ cash discount if the amount is paid within $2$ days, with balance due in $30$ days

$2\%$ discount if paid within $30$ days