when the commercial paper matures investors in effect receive an interest payment of 100 000 along with the 10 million they loaned out this equates to an interest rate of 1 this interest rate can be adjusted for time contingent on the number of days the commercial paper is outstanding 
say the term of the commercial paper is 30 days this means the firm will raise 10 million today and in 30 days it may repay 10 1 million to investors holding the commercial paper 