Question

the interest on a certain depost at 4.5 % p.a is rs 405 in one year. how muvh will the additional interest in one year be on thr same deposti at 5 % p.a​

Answer 1

Given:-

•Principal is given here 405 rupees at rate of interest is 4.5% per annum and time is given one year and in one year on the rate of interest is 5% per annum.

To Find:-

•First simple interest and then after find the first then we will find another on simple interest on 5% per annum.

Solution:-

we have,

• Principal = 405 rupees
• Time = 1 year
• Rate = 4.5%

Using Formula:

$\: \: \sf \: simple \: interest = \frac{principal \times rate \times time}{100}$

Now substitue the values,

$\: \: \sf \: s.i = \frac{405 \times 45 \times1 }{100 \times 10} \\ \\ \: \: \sf \: s.i = \frac{729}{40} = 18.225 \: rupees$

Now again find Simple Interest on 5%

$\: \: \sf \: simple \: interest = \frac{405 \times 5 \times 1}{100} \\ \\ \: \: \sf \: s.i = \frac{81}{4} = 20.25 \: rupees$

Hence,Simple Interest is 20.25 rupees.

____________________________