Suppose you have two student loans:
$15,000 with an APR of 8% for 15 years
$10,000 with an APR of 9.5% for 20 years
How much do you pay each month?
How long do you have to pay that monthly amount?
Over the course of each loan, how much total do you pay?
How much of that is interest? How much interest will you pay in total?
You have the opportunity to consolidate these 2 loans into a single loan with an APR of 8% and a term of 12 years.