math- please help me

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

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  1. 1.015(600 / 24) = $25.38 a month

    1.0175(600/24) = ?

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    Ms. Sue
  2. 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

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    Ms. Sue
  3. 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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  4. Please see my second post.

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    Ms. Sue

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