The credit terms offered to a customer by a business firm are $\frac{3\mathrm{.}2}{10},\frac{n}{30},$ which means that

the customer must pay the bill within $10$ days.

two sales returns can be made within $10$ days of the invoice date and no returns thereafter.

the customer can deduct a $3\mathrm{.}2\%$ discount if the bill is paid within $10$ days of the invoice date.

the customer can deduct a $3\mathrm{.}2\%$ discount if the bill is paid between the $10$ th and $30$ th day from the invoice date.