SOLUTION: Please help with the homework: Liza purchases an apartment by paying a deposit of R60000, and obtains a 20 year loan for the balance of R120000 at 20% interest rate per annum comp

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Question 1196141: Please help with the homework:
Liza purchases an apartment by paying a deposit of R60000, and obtains a 20 year loan for the balance of R120000 at 20% interest rate per annum compounded monthly. After four and half years, the bank adjusts the interest rate to 18% per annum compound monthly. What is the new amount that he must pay if the term of the loan remains the same?

Found 2 solutions by ikleyn, MathTherapy:
Answer by ikleyn(52784) About Me  (Show Source):
You can put this solution on YOUR website!
.
Please help with the homework:
Liza purchases an apartment by paying a deposit of R60000, and obtains a 20 year loan for the balance
of R120000 at 20% interest rate per annum compounded monthly. After four and half years, the bank adjusts
the interest rate to 18% per annum compound monthly. What is the new amount that he must pay if the term
of the loan remains the same?
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Who is "he" in your post ?



Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!
Please help with the homework:
Liza purchases an apartment by paying a deposit of R60000, and obtains a 20 year loan for the balance of R120000 at 20% interest rate per annum compounded monthly. After four and half years, the bank adjusts the interest rate to 18% per annum compound monthly. What is the new amount that he must pay if the term of the loan remains the same?
STEP 1: Determine the monthly payment. 
        However, instead of using an online mortgage calculator, I believe it'd be better to find this 
        using the following formula:
          , where: 
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STEP 2: Calculate the PRESENT VALUE of an ANNUITY, for 15.5 years, or 15.5(12) = 186 FUTURE monthly payments 
        (calculated in STEP 1), and at the same interest rate (.2, or 20%).
      **Note that 4.5 years' (54 monthly) payments were already made. 
        Again, instead of using an online  calculator, I believe it'd be better to find this 
        using the following formula:
          , where: 
=================================================
STEP 3: Determine the NEW monthly payment. 
        However, instead of using an online mortgage calculator, I believe it'd be better to find this 
        using the following formula:
          , where: 

When all is "said and done," the NEW, lowered monthly mortgage payment should be $1,800.47, down from $2,038.59.
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