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If Shs 200,000 is deposited in an account each month for 10 years and the account earns 7% compounded monthly, how much will be in the account after the last deposit is made.

Mathematics

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Answer

Shs 34,637,797.52\text{Shs } 34,637,797.52

Step-by-step solution

4 steps

Hili ni swali kuhusu thamani ya baadaye ya akiba (future value of an ordinary annuity).

  1. Tambua vigezo vilivyotolewa.

    Kiasi cha amana ya kila mwezi (PMTPMT) = Shs 200,000
    Kiwango cha riba ya kila mwaka (rr) = 7% = 0.07
    Muda (tt) = miaka 10
    Riba huhesabiwa kila mwezi, kwa hivyo idadi ya vipindi vya kuhesabu riba kwa mwaka (mm) = 12.

  2. Kokotoa kiwango cha riba kwa kipindi (ii) na idadi kamili ya vipindi (nn).

    Kiwango cha riba kwa mwezi (ii) = rm\frac{r}{m}

    i=0.0712i = \frac{0.07}{12}

    Jumla ya idadi ya amana (nn) = t×mt \times m

    n=10 miaka×12 miezi/mwaka=120 miezin = 10 \text{ miaka} \times 12 \text{ miezi/mwaka} = 120 \text{ miezi}
  3. Tumia fomula ya thamani ya baadaye ya akiba (Future Value of an Ordinary Annuity).

    Fomula ni:

    FV=PMT×((1+i)n−1)iFV = PMT \times \frac{((1 + i)^n - 1)}{i}

    Badilisha vigezo kwenye fomula:

    FV=200,000×((1+0.0712)120−1)0.0712FV = 200,000 \times \frac{((1 + \frac{0.07}{12})^{120} - 1)}{\frac{0.07}{12}}
  4. Kokotoa thamani.

    Kwanza, kokotoa 1+i1 + i:

    1+0.0712≈1+0.0058333333=1.00583333331 + \frac{0.07}{12} \approx 1 + 0.0058333333 = 1.0058333333

    Kisha, kokotoa (1+i)n(1 + i)^n:

    (1.0058333333)120≈2.010269078(1.0058333333)^{120} \approx 2.010269078

    Sasa, kokotoa namba ya juu ya sehemu:

    2.010269078−1=1.0102690782.010269078 - 1 = 1.010269078

    Kisha, kokotoa namba ya chini ya sehemu:

    0.0712≈0.0058333333\frac{0.07}{12} \approx 0.0058333333

    Sasa, gawanya namba ya juu kwa namba ya chini:

    1.0102690780.0058333333≈173.1889876\frac{1.010269078}{0.0058333333} \approx 173.1889876

    Mwishowe, zidisha kwa PMTPMT:

    FV=200,000×173.1889876FV = 200,000 \times 173.1889876 FV≈34,637,797.52FV \approx 34,637,797.52

    Kiasi kitakachokuwa kwenye akaunti baada ya amana ya mwisho kufanywa ni Shs 34,637,797.52.

    Shs 34,637,797.52\text{Shs } 34,637,797.52
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