Acredit card company uses these rules to calculate the minimum amount owed: for a bill of less than $100, the entire amount is due. for a bill of at least $100 but less than $500, the minimum due is $100. for a bill of at least $500 but less than $1,000, the minimum due is $300. for a bill of $1,000 or more, the minimum due is $500. which graph shows the minimum amount due for a credit amount of x (given that the credit limit is $2,000).