Question

A sum of simple interest amounts to rupees 1392 in two years,and rupees 1680 in five years. The rate of percentage per annum is:

Answer 1

69,420 is the answer m8. now give me big brain award

Answer 2

Answer: the rate percent per annum is 859.

Explanation: -

Given - Interest amount of rupees 1392 in two years and rupees 1680 in five years.

Find-Rate of percentage per annum is-

Simple interest is a quick and easy method of calculating the interest charge on a loan. Simple interest is determined by multiplying the daily interest rate by the principal by the number of days that elapse between payments.

$SI=\frac{P\times R \times I}{100}$

Principle = Amount - Interest

Let the rate of interest be r

Amount in 2 year$=Rs 1392$

Amount in 5 years $=Rs 1680$

Simple interest in one year$=1680-1392$

$=288$

Simple interest in two years $=2 \times 288$

$=Rs 576$

Now,

Principle$=Amount-Interest=1392-576$

$=Rs 816$

So, simple interest $=\frac{816 \times 2 \times r}{100}$

According to the question

$576=\frac{816 \times 2 \times r}{100}$

$r=\frac{576 \times 100}{816 \times 2}$

$r=35$%

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