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milliex51

Tian opened a saving account on January 1st with a deposite of $150. The following July 1st, January 1st, and July 1st, he made 3 more deposits of $150 each. The account paid interest at 3.75% per annum, compounded semi-annually. a) What amount did Tian have in his account at the end of the second year? b) How much interest did Tian earn by the end of the second year?

  • 2 years ago
  • 2 years ago

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  1. BlingBlong
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    Do it in segments remember that there are 12 months in a year. n=2

    • 2 years ago
  2. milliex51
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    I tried R, refular deposits (payment) = 150, n, number of deposits or payment = 3, and i, interest rate per compounding period: 0.03765/2 = 0.01875. I got $458. 50 in the end using this formula: A = R [(1 + i)^n - 1 / i. However, the correct answers are: a) $617.09 and b) $17.09

    • 2 years ago
  3. BlingBlong
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    n = 2 because it is compounded twice a year so every six months 3.75% of the money present in the account is added to the original amount invested.

    • 2 years ago
  4. milliex51
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    ohh.. so what's the function of the 'he made 3 more deposits of $150.'?

    • 2 years ago
  5. BlingBlong
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    We know the original amount was compounded once before he made his second investment, then compounded again when he made his third investment than compounded again when he made his fourth investment

    • 2 years ago
  6. milliex51
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    yup, he did.

    • 2 years ago
  7. BlingBlong
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    To answer b) The first compound can be expressed as (0.0375)*150 + 150 The second compound he added 150 so for the second compound (first year we have the expression) ((((0.0375)*150 + 150) + 150)0.03 + ((((0.0375)*150 + 150) + 150)

    • 2 years ago
  8. BlingBlong
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    I would probably just try answering this manually :L

    • 2 years ago
  9. milliex51
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    ohhh, okay. So do I still use the formula or.. no?

    • 2 years ago
  10. BlingBlong
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    well you could use it for every compound but make sure you change the principle accordingly

    • 2 years ago
  11. BlingBlong
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    I'm sure there is a way to modify the equation so that ever time there is a compound 150 is added plus the interest

    • 2 years ago
  12. milliex51
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    ohh.. okay. ohhhh.. like this: R + R(1 + i)^1 + R(1 + i)^2 + R(1+i)^3 +... + R (1+i)^n-1? And calculate the sum of the series: which is basically the formula?

    • 2 years ago
  13. milliex51
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    oh, that one is for compounding interests isn't it?

    • 2 years ago
  14. BlingBlong
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    yeah but I was wrong the formula has to take in account the added 150 after each compound

    • 2 years ago
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