Final answer:
After one year, Susan will have $5,500 remaining on her interest-free loan. It will take her 35 months to fully repay the $8,500 loan with monthly payments of $250.
Step-by-step explanation:
Susan has an interest-free loan of $8,500 from her father. She has committed to repay this loan at a rate of $250 per month. After one year, which is 12 months, she would have repaid a total of 12 x $250 = $3,000. Thus, the amount remaining on her loan after one year would be $8,500 - $3,000 = $5,500.
To determine when she will have paid off the loan completely, we divide the total loan amount by the monthly repayment amount. Therefore, $8,500 / $250 = 34 months. Since this is not a whole number, it will take her 35 months to fully repay the loan, with the last payment being less than $250.