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Math Help - Simple interest

  1. #1
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    Simple interest

    Hi,
    I'm trying to figure out, how to solve this problem, I'm sorry about my english, I've tryed to do my best to translate the problem properly.

    Question:

    Mr. A as deposited a given amount, on a anual tax of 7%. After 6 months, Mr B deposited more $1200 then Mr A, but on an anual tax of 9%. After 18 months from the first aplication (by Mr A), Mr B recieved an interested of $27,75 more then Mr A

    Considering Simple Interest regime, determinate how much was deposited by each one


    Any sugestion is appreciated! Tks!
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  2. #2
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    Quote Originally Posted by heldrida View Post
    Question:

    Mr. A as deposited a given amount, on a anual tax of 7%. After 6 months, Mr B deposited more $1200 then Mr A, but on an anual tax of 9%. After 18 months from the first aplication (by Mr A), Mr B recieved an interested of $27,75 more then Mr A

    Considering Simple Interest regime, determinate how much was deposited by each one


    Any sugestion is appreciated! Tks!
    Comprehensible translation. A little rough, but I think I get it.

    A = Amount deposited by Mr. A
    B = Amount deposited by Mr. B
    B = A + 1200

    Interest for Mr. A: IA = A * 0.07 * (18/12)

    Interest for Mr. B: IB = B * 0.09 * (12/12)

    IB - IA = $27,75

    Can you finish?

    For your benefit, let's see if I can re-translate for you.

    Mr. A deposited a given amount with an annual interest rate of 7%. After 6 months, Mr B deposited $1200 more than Mr A, but with an anual interest rate of 9%. After 18 months from the first deposit (by Mr A), Mr B recieved interest of $27,75 more then Mr A.

    Use Simple Interest and determinate how much was deposited by each.
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  3. #3
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    Thanks a lot!

    I'm going review your answer and check with my own! Hopefully I can finish it, this time, let's see...
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  4. #4
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    Hi again,

    I've done my best on this problem, but I've still not reached the same result that I find on "solutions", that is:

    A = 5.350
    B = 6.550

    I'm probably missing something, I dont know, its hard to learn stuff alone.

    Thanks
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  5. #5
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    Quote Originally Posted by heldrida View Post
    A = 5.350
    B = 6.550
    CORRECT...if that means $5,350 and $6,550.

    Don't forget to divide percentages by 100 when doing calculations;
    as example, 7% = .07
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  6. #6
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    Ah! Thanks finally solved =D
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