Question

At what rate percent per annum will rs.1650 amount to rs.2046 is 3 years

Answer 1

given,
principal= 1650
amount= 2046
SI= A - P
=> 2046-1650
=>396
time= 3 years
rate = ?
rate = SI × 100/ P ×T
=> 396×100/1650×3
=> 39600/4950
=> 8
hence,, the required rate is 8% per annum

Answer 2

Given:

At what rate per cent per annum will rs.1650 amount to rs.2046 is 3 years

To Find:

Find the rate of interest.

Solution:

To find the interest here we are assuming it to be simple interest as nothing is mentioned, if it needs to be compound interest the same will be mentioned, so the formula for simple interest is,

$SI=\frac{PRT}{100}$

where,

          SI= simple interest

           P= principal amount

           R= rate of interest

           T= period

Now the interest here will be,

SI=2046-1650

  =396

and P is Rs1650 and the time period is 3 years

So we can apply the same in the formula taking a rate of interest as 'r'

$396=\frac{1650*r*3}{100} \\r=8\%$

Hence, the rate of interest is 8%.