# Math Help - Superannuation and Loan Repayment Questions Part Two

1. ## Superannuation and Loan Repayment Questions Part Two

A man invests $140 per month in a superannuation fund. If the interest is paid at 10% p.a, what will his investment be worth after 40 years? Kathy borrows$5000 from a Credit Union to buy a violin. The interest rate is initially 16.2% p.a calculated monthly. After 2 years the rate changes to 17.1% p.a. If the loan is to be paid off in 4 years, find her original repayment and the increase in her repayment for the 3rd and 4th year.

I am having trouble with these two questions, thank you so much for any help given.

2. Hi, Try this for Question (2)
Code:
Row No  Column(A)                                           Column(B)         Column(C)         Column(D)  Column(E)
1.      Capital Borrowed for 48 mths @ 16.2%                Rate +1           Mth Rate +1       Term       Term+1
2.      5000                                                1.162             1.01259048934984  48         49
3.      Repayment 48Mths =
4.      =+(A2*((C2^E2)-(C2^D2)))/((C2^D2)-1)                139.429114672957
5.
6.      Capital left @ 24Mths =
7.      =+((A2*((C2^25)-(C2^24)))-(F1*((C2^24)-1)))/(C2-1)  2872.56131703764
8.
9.      Rem' Cap invested for 24 Mths @ 17.1%               1.171             1.01324174595559  24         25
10.     2872.56131703772
11.     Mthly Repayment For last 2 Years
12.     =+(A10*((C9^E9)-(C9^D9)))/((C9^D9)-1)               140.498735555352
Regards Mick