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yarga [219]
2 years ago
10

X = 12 4 x + 15 = Substitute the given variable

Mathematics
2 answers:
sashaice [31]2 years ago
8 0
I think the answer 63 thats my guess lol
S_A_V [24]2 years ago
5 0
4(12)+15
4*12 is 48
48+15 is 63
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In how many year the interest will became equal to the principal is rs.1200 is deposited at the rate of 25% in a bank ​
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Given:

Principal = Rs. 1200

Rate of interest = 25%

To find:

The time in which the interest will became equal to the principal.

Solution:

We have,

P=1200

r=\dfrac{25}{100}

r=0.25

If interest is equal to the principal, then

Amount=Principal+Interest

Amount=1200+1200

Amount=2400

The formula for amount is:

A=P\left(1+r)^n

Substituting A=2400, P=1200, r=0.25 in the above formula, we get

2400=1200(1+0.25)^n

\dfrac{2400}{1200}=(1.25)^n

2=(1.25)^n

Taking log on both sides, we get

\log2=\log(1.25)^n

\log2=n\log(1.25)               [\because \log a^b=b\log a]

\dfrac{\log2}{\log(1.25)}=n

n\approx 3.11

Therefore, the interest will became equal to the principal in about 3.11 years.

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