Question 1192975
the monthly payment at the end of each month for the loan at 4.3% per year compounded monthly is 682.13.
the monthly payment at the end of each month for the loan at 6.9% per year compounded monthly is 709.12.
the calculator i used is at <a href = "https://arachnoid.com/finance/index.html" target = "_blank">https://arachnoid.com/finance/index.html</a>
inputs are everything except pmt.
output is pmt.
first display is at 4.3% per year compounded monthly.
second display is at 6.9% per year compounded monthly.


<img src = "http://theo.x10hosting.com/2022/040911.jpg" >


<img src = "http://theo.x10hosting.com/2022/040912.jpg" >


total interest on the 4.3% loan is 36 * 682.13 - 23000 = 1556.68.
total interest on the 6.9% loan is 36 * 709.12 - 23000 = 2528.32
difference is 971.64.


your solution is that she would have saved 971.64 in total interest if she took the manufacturer's loan instead of the bank's loan.