Find the principal if the interest compounded annually at the rate of 10% for two years is Rs 210.

Explanation

To find the principal amount when the compound interest is given, we can follow these steps:

### Step 1: Understand the formula for compound interest
The formula for compound interest is given by:
\[ A = P \left(1 + \frac{r}{100}\right)^n \]
Where:
- \( A \) is the total amount after interest,
- \( P \) is the principal amount (the initial amount),
...