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    Vijay has Rs. 1218 with him. He divided it amongst his sons Ajay and Prakash and asked them to invest it at 10% rate of interest compounded annually.
    Question

    Vijay has Rs. 1218 with him. He divided it amongst his sons Ajay and Prakash and asked them to invest it at 10% rate of interest compounded annually. It was seen that Ajay and Prakash got same amount after 14 and 15 years respectively. How much (in Rs. ) did Vijay give to Prakash?

    A.

    638

    B.

    580

    C.

    430

    D.

    738

    Correct option is B

    Given:

    Total amount = ₹1218

    Ajay's investment time = 14 years

    Prakash's investment time = 15 years

    Interest rate = 10% p.a. compounded annually

    Final amounts received by both = Equal

    Formula Used:

    Amount on Compound interest = P(1+r100)tP(1 + \frac{r}{100})^t​​

    where P = principal, r = rate of interest, t = time

    Solution:

    As we Amount receive is equal,

    So,

    P1(1+10100)14=P2(1+10100)15P_1\left(1+\frac{10}{100}\right)^{14} = P_2\left(1 +\frac{10}{100}\right)^{15} ​​

    P1(1.1)14=P2(1.1)15P_1(1.1)^{14} = P_2(1.1)^{15}​​​​

    P1:P2=22:20\implies P_1 : P_2 = 22 : 20​​

    Let Ajay’s share = ₹22x and Prakash's share = ₹20x

    22x + 20x = 1218
    42x = 1218

    x = 121842=29\frac{1218}{42} = 29​ 

    Prakash's share = ₹29 × 20 = ₹580

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