math- please help me - Ms. Sue

Sheds R Us sells $600 sheds on a monthly payment plan over 2 years.
a) If the interest rate is 1.5% per month, find the monthly payment.
Answer = $
b) If instead the interest rate is 1.75% per month, find the monthly payment
Answer = $
can anyone help me with which format i should use .. have tried several, none of which seem to be correct.
Thought A was 25.46
and B was 25.75
but both are wrong

1.015(600 / 24) = $25.38 a month

1.0175(600/24) = ?

A more realistic way to interpret this problem is

1.5% a month interest is actually 18% annual interest rate.

I = PRT

I = 600 * 0.18 * 2

I = 216

816 / 24 = 34 a month payment


1.015(600 / 24) =
$25.38 is showing up wrong.
1.0175(600/24) = 25.44 which is showing wrong too.

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  1. Try my more realistic procedure.

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    Ms. Sue
  2. I = PRT

    I = 600 * 0.18 * 2

    I = 216

    816 / 24 = 34 a month payment?

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  3. Yes. The payment would be $34 a month at an interest rate of 1.5% monthly.

    Then do the same procedure for the other interest rate.

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    Ms. Sue
  4. $34 is coming up wrong too

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  5. I'm sorry -- but apparently I steered you wrong.

    Please repost your original question as a New Question. Perhaps a real math tutor can help you with the answer. Be sure to include the answers we've discussed.

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    Ms. Sue
  6. Original question:
    Sheds R Us sells $600 sheds on a monthly payment plan over 2 years.
    a) If the interest rate is 1.5% per month, find the monthly payment.
    Answer = $
    b) If instead the interest rate is 1.75% per month, find the monthly payment
    Answer = $
    my solutions tried:
    1.015(600 / 24) = $25.38 a month
    1.0175(600/24) = $$25.44

    I also tried the following:

    a.)
    1-(1+.015/12)/12)^-24 / (.015/12) = .0295362856/.00125 = 23.62902848 … 600/2362902848=25.39249553 entered 23.63
    b.)
    1-(1+.0175/12)^-24/(.0175/12) = .0343699643/.0014583333 = 23.5679706
    Entered 23.57

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  7. The above method results in an interest rate much higher than 18%.
    Explanation:
    The $216 of simple interest would be valid if there were no payments made and you would just pay back the $816 after 2 years.
    BUT, you are making payments of $34 each month so the balance keeps getting smaller and for each consecutive month the interest would be lower than the previous one.
    Using the compound interest formula, which would be generally used for this type of problem
    Paym( 1 - 1.015^-24)/.015 = 600

    paym = $29.95

    At a payment of $34, we would have

    34(1 - (1+x)^-24)/x = 600

    Wolfram has x = .026216 or 31.5% per annum

    http://www.wolframalpha.com/input/?i=solve+34%281+-+%281%2Bx%29%5E-24%29%2Fx+%3D+600

    Here is a break-down of
    time-payment-interest-repayment-balance

    0 0.00 0.00 0.00 600.00
    1 29.95 9.00 20.95 579.05
    2 29.95 8.68575 21.26425 557.78575
    3 29.95 8.366786 21.583214 536.202536
    4 29.95 8.043038 21.906962 514.295574
    5 29.95 7.714434 22.235566 492.060008
    6 29.95 7.3809 22.5691 469.490908
    7 29.95 7.042364 22.907636 446.583272
    8 29.95 6.698749 23.251251 423.332021
    9 29.95 6.34998 23.60002 399.732001
    10 29.95 5.99598 23.95402 375.777981
    11 29.95 5.63667 24.31333 351.464651
    12 29.95 5.27197 24.67803 326.786621
    13 29.95 4.901799 25.048201 301.73842
    14 29.95 4.526076 25.423924 276.314496
    15 29.95 4.144717 25.805283 250.509214
    16 29.95 3.757638 26.192362 224.316852
    17 29.95 3.364753 26.585247 197.731605
    18 29.95 2.965974 26.984026 170.747579
    19 29.95 2.561214 27.388786 143.358792
    20 29.95 2.150382 27.799618 115.559174
    21 29.95 1.733388 28.216612 87.342562
    22 29.95 1.310138 28.639862 58.7027
    23 29.95 0.880541 29.069459 29.633241
    24 29.95 0.444499 29.505501 0.127739

    sorry about the spacing and the extra decimals, I ran a very old-fashioned computer program. The extra 12 cent error at the end is caused by the round off of the $29.95

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  8. Thanks, Reiny.

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    Ms. Sue
  9. paym = $29.95
    for A is correct. thank you.

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