Question

What principal will earn interest of 840 at the rate of21/2%
annum in 3 years.​

Answer 1

SOLUTION:-

Given:

⚫Interest= Rs.840

⚫Rate= 21/2%= 10.5%

⚫Time= 3years.

We know that Formula of Simple Interest;

$= > \frac{P\times R\times T}{100}$

Therefore,

We need find principal then;

$= > P = \frac{S.I. \times 100}{R \times T} \\ \\ = > \frac{840 \times 100}{10.5 \times 3} \\ \\ = > \frac{840 \times 100 \times 10}{105 \times 3} \\ \\ = > \frac{8 \times 1000}{3} \\ \\ = > Rs.(1000 \times 2.66) \\ \\ = >P= Rs.2660$

Thus,

Principal is Rs.2660.

Hope it helps ☺️