Question 1111723
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Your answers for a and b are right; so you know what you are doing.  You shouldn't need much help with the rest....<br>
For part c, multiply the monthly payment amount (answer for part b) times the number of payments (360) to get the total amount of all the payments; the interest you pay is the difference between that total and the original amount of the loan.<br>
For part d the calculation is the same as what you did for part b, except now you are making 180 payments instead of 360.<br>
Then calculate the total amount of payments for the 15-year loan, and the total amount of interest for the 15-year loan (using the same process as in part c).  Then the answer for part e is the difference between the two amounts of total interest for the 30-year and 15-year loans.